Weed Photo Gallery

Select a photo below to view associated weed fact sheet.

Weeds: Annual bluegrass – Poa annua

Weeds: Annual bluegrass – Poa annua categories: Weeds revision date: 2022-12-14 12:00 Annual bluegrassPhoto by: T. Miller Family: Poaceae (Graminae) Cycle: Annual/Perennial Plant type: Grass Biology Annual bluegrass leaves are folded in the bud and have a distinct midvein. The leaves are about 1⁄8 inch wide and cupped at the tip like the prow of […]

Weeds: Barnyardgrass – Echinochloa crus-galli

Weeds: Barnyardgrass – Echinochloa crus-galli categories: Weeds revision date: 2022-12-14 12:00 BarnyardgrassPhoto by: J.A. Kropf Family: Poaceae (Graminae) Cycle: Summer annual Plant type: Grass Biology Barnyardgrass grows in clumps up to five feet tall. Leaf blades are smooth, flat, and broad (about 1⁄2 inch or more) with a pointed tip. The leaf sheaths are smooth […]

Weeds: Bentgrass, creeping – Agrostis stolonifera

Weeds: Bentgrass, creeping – Agrostis stolonifera categories: Weeds revision date: 2022-12-15 12:00 Creeping bentgrassPhoto by: B.M. Johnson Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Biology Creeping bentgrass is a low-growing, perennial grass. Unmowed plants can reach 8 to 20 inches in height. The leafy stolons lie along the ground, rooting in the soil. In […]

Weeds: Bermudagrass – Cynodon dactylon

Weeds: Bermudagrass – Cynodon dactylon categories: Weeds revision date: 2022-12-15 12:00 Bermudagrass bladesPhoto by: D.G. Swan Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Biology Bermudagrass is a warm-season perennial grass that typically is prostrate and spreads to form dense patches. Spread occurs by both rhizomes and aboveground stems which root at the nodes. The […]

Weeds: Birdfoot Trefoil – Lotus corniculatus

Weeds: Birdfoot Trefoil – Lotus corniculatus categories: Weeds revision date: 2022-12-15 12:00 Birdfoot Trefoil flowersPhoto by: Albert Herring CC 2.0 Family: Fabaceae Cycle: Perennial Plant type: Broadleaf Biology Lotus corniculatus can be identified by its unique shaped leaves that alternate on the main stem, are trifoliate (3 terminal leaflets at the apex), and have two […]

Weeds: Bittercress (Shotweed, Hairy bittercress) – Cardamine hirsuta

Weeds: Bittercress (Shotweed, Hairy bittercress) – Cardamine hirsuta categories: Weeds revision date: 2022-12-17 12:00 Hairy bittercress rosette (1)Photo by: T.W. Miller Family: Brassicaceae (Cruciferae) Cycle: Winter annual Plant type: Broadleaf Biology Little bittercress is a fall/winter-germinating annual species growing to less than five inches tall. Leaves are compound with one large terminal leaflet and several […]

Weeds: Bittersweet nightshade (European bittersweet) – Solanum dulcamara

Weeds: Bittersweet nightshade (European bittersweet) – Solanum dulcamara categories: Weeds revision date: 2022-12-17 12:00 Bittersweet nightshade fruitsPhoto by: T.W. Miller Family: Solanaceae Cycle: Perennial Plant type: Broadleaf Biology Bittersweet nightshade is a trailing to climbing, viny plant with stems reaching up to ten feet. The dark green leaves are alternate on the slender stems, which […]

Weeds: Black medic – Medicago lupulina

Weeds: Black medic – Medicago lupulina categories: Weeds revision date: 2022-12-17 12:00 Black medic stem and leavesPhoto by: T.W. Miller Family: Fabaceae (Leguminosae) Cycle: Annual Plant type: Broadleaf Biology Black medic is very clover-like in appearance and is sometimes called Japanese clover. Leaves are alternate on the stems and divided into three leaflets. The center […]

Weeds: Blackberry (Himalayan, Evergreen, Pacific) – Rubus spp.

Weeds: Blackberry (Himalayan, Evergreen, Pacific) – Rubus spp. categories: Weeds revision date: 2022-12-17 12:00 Blackberry fruitPhoto by: T.W. Miller Family: Rosaceae Cycle: Perennial Plant type: Broadleaf Biology Several species of blackberries may be considered weeds. Among these are evergreen or cutleaf blackberry (Rubus laciniatus), the native dewberry or Pacific blackberry (R. ursinus), and Himalayan blackberry […]

Weeds: Blue mustard (Purple mustard, Tenella mustard) – Chorispora tenella

Weeds: Blue mustard (Purple mustard, Tenella mustard) – Chorispora tenella categories: Weeds revision date: 2022-12-17 12:00 Blue mustard with flowersPhoto by: J.A. Kropf Family: Brassicaceae (Cruciferae) Cycle: Winter annual Plant type: Broadleaf Biology Blue mustard is a leafy, taprooted winter annual. Plants branch primarily from the base, with some branching of the flowering stems, as […]

Weeds: Brackenfern, western – Pteridium aquilinum

Weeds: Brackenfern, western – Pteridium aquilinum categories: Weeds revision date: 2022-12-17 12:00 Western brackenfern frondsPhoto by: R. Parker Family: Dennstaedtiaceae (Polypodiaceae) Cycle: Perennial Plant type: Other Biology Brackenfern grows from creeping rhizomes, which can spread the plant over a large area. The hairy rhizomes are brown and woody. Leaves (fronds) are generally triangular in outline […]

Weeds: Buffalobur – Solanum rostratum

Weeds: Buffalobur – Solanum rostratum categories: Weeds revision date: 2022-12-17 12:00 Buffalobur with flowersPhoto by: D.G. Swan Family: Solanaceae Cycle: Annual Plant type: Annual Biology Buffalobur is an exceptionally spiny annual plant growing about two feet high. The alternate leaves have deep, rounded lobes and are two to five inches long. The leaves are prickly […]

Weeds: Bull thistle – Cirsium vulgare

Weeds: Bull thistle – Cirsium vulgare categories: Weeds revision date: 2022-12-17 12:00 Bull thistle flowerPhoto by: J.A. Kropf Family: Asteraceae (Compositae) Cycle: Biennial Plant type: Broadleaf Biology A first-year plant of bull thistle is a rosette of deeply lobed, wavy-margined leaves. The upper surface of the leaves is prickly and hairy, while the underside is […]

Weeds: Buttercup, creeping – Ranunculus repens

Weeds: Buttercup, creeping – Ranunculus repens categories: Weeds revision date: 2022-12-17 12:00 Creeping buttercup flowersPhoto by: T.W. Miller Family: Ranunculaceae Cycle: Perennial Plant type: Broadleaf Biology Creeping buttercup is a creeping perennial plant that is usually fairly low-growing. The stems are hairy and root at the nodes when they contact the soil. Leaves are also […]

Weeds: Butterfly bush – Buddleja davidii

Weeds: Butterfly bush – Buddleja davidii categories: Weeds revision date: 2022-12-17 12:00 Buddleja davidii ‘Fascination’Photo by: Ptelea; CC BY-SA 3.0 Family: Scrophulariaceae Cycle: Perennial Plant type: Broadleaf Biology Butterfly bush, Buddleja davidii, is a deciduous shrub that grows from 3 to 15 ft tall. Until only recently, this species was celebrated for its robust growth, […]

Weeds: Canada thistle – Cirsium arvense

Weeds: Canada thistle – Cirsium arvense categories: Weeds revision date: 2022-12-17 12:00 Canada thistle leaves and flowerPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology Canada thistle is an aggressive, spreading weed. The aboveground portions of the plants die back in the winter, but resprout from perennial roots in the spring. […]

Weeds: Catchweed bedstraw (Cleavers) – Galium aparine

Weeds: Catchweed bedstraw (Cleavers) – Galium aparine categories: Weeds revision date: 2022-12-16 12:00 Catchweed bedstraw leaf whorlsPhoto by: T.W. Miller Family: Rubiaceae Cycle: Annual Plant type: Broadleaf Biology Catchweed bedstraw is a weakly erect to sprawling plant from a slender taproot. Stems are weak, climbing or twining to over six feet in length. The stems […]

Weeds: Catsear, common (False dandelion) – Hypochaeris radicata

Weeds: Catsear, common (False dandelion) – Hypochaeris radicata categories: Weeds revision date: 2022-12-16 12:00 Common catsear rosettePhoto by: J.A. Kropf Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology Common catsear, also known as false dandelion or spotted catsear, grows in a rosette, with all the leaves at the base of the plant. Roots are […]

Weeds: Chickweed, common and mouseear – Stellaria media, Cerastium fontanum ssp. vulgare

Weeds: Chickweed, common and mouseear – Stellaria media, Cerastium fontanum ssp. vulgare categories: Weeds revision date: 2023-01-09 12:00 Common chickweed leaves and flowersPhoto by: R. Parker Family: Caryophyllaceae Cycle: Annual, Perennial Plant type: Broadleaf Biology COMMON CHICKWEED reproduces both by seeds and by many creeping stems which can root at the nodes. While the plants […]

Weeds: Clover – Trifolium spp.

Weeds: Clover – Trifolium spp. categories: Weeds revision date: 2022-12-16 12:00 Clover flowersPhoto by: R. Parker Family: Fabaceae (Leguminosae) Cycle: Various Plant type: Broadleaf Biology Clovers, depending on species, may be annuals or perennials. Typically, clovers are fairly low-growing, herbaceous plants. The leaves are divided into three leaflets which are attached to the petiole at […]

Weeds: Comfrey – Symphytum officinale

Weeds: Comfrey – Symphytum officinale categories: Weeds revision date: 2022-12-16 12:00 Comfrey bell-shaped flowersPhoto by: T.W. Miller Family: Boraginaceae Cycle: Perennial Plant type: Broadleaf Biology Comfrey has clump-forming perennial roots with brown to black bark. The roots are thick and penetrate deep in the soil, making comfrey difficult to eradicate once established. Plants are from […]

Weeds: Crabgrass – Digitaria spp.

Weeds: Crabgrass – Digitaria spp. categories: Weeds revision date: 2022-12-16 12:00 CrabgrassPhoto by: R. Parker Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Biology Large crabgrass (Digitaria sanguinalis) may reach up to two feet tall but is often prostrate. Stems lying along the ground may root, forming mats. The flat leaf blades are relatively broad […]

Weeds: Creeping Jenny: Lysimachia nummularia

Weeds: Creeping Jenny: Lysimachia nummularia categories: Weeds revision date: 2022-12-19 12:00 Creeping Jenny flowerPhoto by: H. Zell Family: Primulaceae Cycle: Perennial Plant type: Evergreen Biology Lysimachia nummularia, commonly called moneywort or creeping Jenny, is a low-growing, creeping ground cover which forms a leafy mat only 2-4″ tall. Roots where leaf nodes come in contact with […]

Weeds: Dandelion – Taraxacum officinale

Weeds: Dandelion – Taraxacum officinale categories: Weeds revision date: 2022-12-16 12:00 Common dandelion with flowersPhoto by: J.A. Kropf Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology The common dandelion is a persistent taprooted plant reproducing by seeds and by short shoots from the crown. It also grows back from roots broken during hand removal. […]

Weeds: Dock (Curly, Broadleaf) – Rumex spp.

Weeds: Dock (Curly, Broadleaf) – Rumex spp. categories: Weeds revision date: 2022-12-15 12:00 Broadleaf dockPhoto by: T.W. Miller Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Biology Curly dock (Rumex crispus), also called sour dock or yellow dock, is a robust tap-rooted perennial growing two to five feet tall. Stems are erect, reddish, and slightly ridged. […]

Weeds: Dodder – Cuscuta spp.

Weeds: Dodder – Cuscuta spp. categories: Weeds revision date: 2022-12-15 12:00 Dodder entwining fuchsia stemPhoto by: R.S. Byther Family: Cuscutaceae Cycle: Annual Plant type: Parasitic Biology The parasitic flowering plant dodder (Cuscuta spp.) attacks living plants by entwining them in its slender stems. Dodder is characterized by its tangle of leafless, yellow to orange threadlike […]

Weeds: Downy brome (Cheatgrass, Downy chess) – Bromus tectorum

Weeds: Downy brome (Cheatgrass, Downy chess) – Bromus tectorum categories: Weeds revision date: 2022-12-15 12:00 Downy brome – cheatgrassPhoto by: J.A. Kropf Family: Poaceae (Graminae) Cycle: Winter annual Plant type: Grass Biology Downy brome is a winter annual (sometimes a summer annual) reproducing by seed. Germination typically occurs during late summer or fall, with overwintering […]

Weeds: Dwarf mistletoes – Arceuthobium spp.

Weeds: Dwarf mistletoes – Arceuthobium spp. categories: Weeds revision date: 2022-12-15 12:00 Dwarf mistletoe in coniferPhoto by: R.S. Byther Family: Loranthaceae Cycle: Perennial Plant type: Parasitic Biology Dwarf mistletoe is a parasitic plant that grows on the branches or occasionally on the trunk of a host tree. Mistletoe shoots range in color from yellowish to […]

Weeds: English daisy (Lawn daisy) – Bellis perennis

Weeds: English daisy (Lawn daisy) – Bellis perennis categories: Weeds revision date: 2022-12-15 12:00 English daisy flowersPhoto by: J.A. Kropf Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology English daisy is a low-growing plant reproducing by seed. It may also spread from the crown to form clumps. The long-stalked leaves are broad at the […]

Weeds: English ivy – Hedera helix

Weeds: English ivy – Hedera helix categories: Weeds revision date: 2022-12-15 12:00 English ivy leavesPhoto by: C.R. Foss Family: Cycle: Plant type: Biology English ivy is a low, dark green, fast-growing evergreen vine. It establishes roots at its nodes as it creeps along the ground, or aerial rootlets as it climbs trees and structures. It […]

Weeds: Field bindweed (Wild morningglory) – Convolvulus arvensis

Weeds: Field bindweed (Wild morningglory) – Convolvulus arvensis categories: Weeds revision date: 2022-12-15 12:00 Field bindweed flowers and leavesPhoto by: D.G. Swan Family: Convolvulaceae Cycle: Perennial Plant type: Broadleaf Biology Field bindweed is a prostrate or twining weed which spreads by seed and by new plants arising from a perennial root system reaching ten feet […]

Weeds: Field pennycress (Fanweed) – Thlaspi arvense

Weeds: Field pennycress (Fanweed) – Thlaspi arvense categories: Weeds revision date: 2022-12-15 12:00 Field pennycress fruitsPhoto by: D.G. Swan Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Biology Field pennycress grows six to eighteen inches tall, branching mainly in the upper, flowering portion of the plant. The leaves are elongate, hairless, and alternate, with larger […]

Weeds: Flixweed – Descurainia sophia

Weeds: Flixweed – Descurainia sophia categories: Weeds revision date: 2022-12-15 12:00 Flixweed stem and flower headPhoto by: J.A. Kropf Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Biology Seedling flixweed plants consist of a low-growing rosette of finely divided, fern-like leaves from a taproot. Mature plants are upright, reaching one to three feet high. Fern-like […]

Weeds: Foxtail (Green, Yellow, Bristly) – Setaria spp.

Weeds: Foxtail (Green, Yellow, Bristly) – Setaria spp. categories: Weeds revision date: 2022-12-16 12:00 Yellow foxtailPhoto by: D.G. Swan Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Biology Three species of foxtails are found in the Pacific Northwest: green foxtail (S. viridis), yellow foxtail (Setaria pumila), and bristly foxtail (S. verticillata). Yellow foxtail grows in […]

Weeds: Garden loosestrife – Lysimachia vulgaris

Weeds: Garden loosestrife – Lysimachia vulgaris categories: Weeds revision date: 2022-12-16 12:00 Garden loosestrife, floweringPhoto by: King County Noxious Weed Control Program Family: Primulaceae Cycle: Perennial Plant type: Broadleaf Biology Garden loosestrife is an erect rhizomatous perennial that may attain a height of three feet or more. Both stems and leaves are soft and hairy […]

Weeds: Giant hogweed – Heracleum mantegazzianum

Weeds: Giant hogweed – Heracleum mantegazzianum categories: Weeds revision date: 2022-12-16 12:00 Giant hogweedPhoto by: Washington Noxious Weed Control Board Family: Apiaceae (Umbelliferae) Cycle: Perennial Plant type: Broadleaf Biology Giant hogweed is a short-lived perennial plant, typically surviving 2 to 5 years. The hollow stems are robust (two- to four-inch diameter), hairy, ribbed, and blotched […]

Weeds: Goldenrods – Solidago spp.

Weeds: Goldenrods – Solidago spp. categories: Weeds revision date: 2022-12-18 12:00 Goldenrod with flowersPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology Most goldenrod species spread by both seeds and by creeping root systems. They are upright plants, growing one to four feet tall or more, depending on species. The leaves […]

Weeds: Ground ivy – Glechoma hederacea

Weeds: Ground ivy – Glechoma hederacea categories: Weeds revision date: 2022-12-18 12:00 Ground IvyPhoto by: Mike Dickison 4.0/deed.en Family: Lamiaceae Cycle: Perennial Plant type: Broadleaf Biology Ground ivy is an aromatic evergreen creeper of the mint family. The leaf produces an aroma when crushed. It may become weedy and invasive in some regions or habitats. […]

Weeds: Groundsel, common – Senecio vulgaris

Weeds: Groundsel, common – Senecio vulgaris categories: Weeds revision date: 2022-12-18 12:00 Common groundsel with seed headsPhoto by: R. Parker Family: Asteraceae (Compositae) Cycle: Annual/Biennial Plant type: Broadleaf Biology Common groundsel may reach four to eighteen inches tall. Seedlings are small rosettes of deeply notched or lobed leaves one to four inches long and 1/4 […]

Weeds: Hawkweeds – Hieracium spp.

Weeds: Hawkweeds – Hieracium spp. categories: Weeds revision date: 2022-12-18 12:00 Orange hawkweed flowerheadsPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Perennial Plant type: Broadleaf Biology Hawkweeds are fibrous rooted perennial herbs that grow up to a foot tall. The leaves are basal, with an occasional leaf or two on stems. The bristly, leafless, flower […]

Weeds: Hedge bindweed – Calystegia sepium (Convolvulus sepium)

Weeds: Hedge bindweed – Calystegia sepium (Convolvulus sepium) categories: Weeds revision date: 2022-12-18 12:00 Hedge bindweed flowersPhoto by: D.G. Swan Family: Convolvulaceae Cycle: Perennial Plant type: Broadleaf Biology Hedge bindweed is a trailing or climbing (twining) perennial plant which spreads aggressively by creeping underground stems and by seeds. Large (one to five inches), dark green, […]

Weeds: Henbit – Lamium amplexicaule

Weeds: Henbit – Lamium amplexicaule categories: Weeds revision date: 2022-12-18 12:00 Flowering henbitPhoto by: T.W. Miller Family: Lamiaceae (Labiatae) Cycle: Annual Plant type: Broadleaf Biology A spreading to erect plant, henbit has the square stems and opposite leaves characteristic of most plants in the mint family. Plants may branch extensively at the base. Branches often […]

Weeds: Herb Robert (Robert geranium, stinky Bob) – Geranium robertianum

Weeds: Herb Robert (Robert geranium, stinky Bob) – Geranium robertianum categories: Weeds revision date: 2022-12-18 12:00 Herb Robert close-up of flower/plantPhoto by: King County Noxious Weed Control Program Family: Geraniaceae Cycle: Winter or spring annual Plant type: Broadleaf Biology Herb Robert is a sprawling to upright plant reaching 2 to 12 inches tall, or taller […]

Weeds: Horsetails (Scouringrush) – Equisetum spp.

Weeds: Horsetails (Scouringrush) – Equisetum spp. categories: Weeds revision date: 2022-12-18 12:00 HorsetailPhoto by: R. Parker Family: Equisetaceae Cycle: Perennial Plant type: Other Biology Field horsetail (Equisetum arvense) grows from a perennial, creeping root system. The rhizomes are brown, somewhat woolly, and bear small tubers. Two types of stems emerge in the spring. Tiny modified […]

Weeds: Horseweed (Marestail) – Conyza canadensis

Weeds: Horseweed (Marestail) – Conyza canadensis categories: Weeds revision date: 2022-12-18 12:00 Horseweed flowerheadsPhoto by: T.W. Miller Family: Asteraceae (Compositae Cycle: Annual Plant type: Broadleaf Biology Horseweed plants range from one to five feet tall. The erect stems may be branched, especially near the top. The alternate, rather narrow leaves are one to three inches […]

Weeds: Knapweeds – Centaurea spp.

Weeds: Knapweeds – Centaurea spp. categories: Weeds revision date: 2022-12-18 12:00 Spotted knapweed flowerheadsPhoto by: B.F. Roche Family: Asteraceae (Compositae) Cycle: Biennial/perennial Plant type: Broadleaf Biology Knapweeds are short-lived perennials with stout taproots. They can have one or more stems, reaching one to three feet in height. Depending on species, leaves may be narrow and […]

Weeds: Knotweeds (Bohemian, Giant, Japanese, Himalayan) – Polygonum spp.

Weeds: Knotweeds (Bohemian, Giant, Japanese, Himalayan) – Polygonum spp. categories: Weeds revision date: 2022-12-18 12:00 Japanese knotweed leavesPhoto by: J.A. Kropf Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Biology The giant knotweeds are aggressive plants that spread via long rhizomes and also by seeds. They are deciduous plants, with the woody, reddish-brown stems dying back […]

Weeds: Kochia – Kochia scoparia

Weeds: Kochia – Kochia scoparia categories: Weeds revision date: 2022-12-18 12:00 Kochia showing fall colorPhoto by: J.A. Kropf Family: Chenopodiaceae Cycle: Annual Plant type: Broadleaf Biology Kochia has a single stem reaching one to six feet high. The main stem is branched above, but typically unbranched at the base. Leaves are soft, hairy, and lance-shaped, […]

Weeds: Lambsquarters, common – Chenopodium album

Weeds: Lambsquarters, common – Chenopodium album categories: Weeds revision date: 2022-12-18 12:00 Common lambsquartersPhoto by: T.W. Miller Family: Chenopodiaceae Cycle: Annual Plant type: Broadleaf Biology Common lambsquarters is typically an upright, branching plant growing one to four feet high from a taproot. The stems are ridged or angular in cross-section and may be tinged with […]

Weeds: Lesser celandine – Ficaria verna

Weeds: Lesser celandine – Ficaria verna categories: Weeds revision date: 2022-12-18 12:00 Lesser celandine close-upPhoto by: S. Campbell Family: Ranunculaceae Cycle: Perennial Plant type: Broadleaf Biology Lesser celandine is a noxious weed. It is highly variable and has club-shaped, tuberous roots. The weed grows as a mounded rosette with basal and stem leaves and can […]

Weeds: Liverworts – Several species

Weeds: Liverworts – Several species categories: Weeds revision date: 2022-12-18 12:00 Liverworts in potPhoto by: J. Altland Family: Various Cycle: Plant type: Bryophyte (mosses & liverworts) Biology Liverworts are low-growing, non-flowering relatives of mosses. They are typically small plants that grow prostrate on the ground. Lacking true roots, they are attached to the soil or […]

Weeds: Mallow, common (Cheeseweed, Buttonweed) – Malva neglecta

Weeds: Mallow, common (Cheeseweed, Buttonweed) – Malva neglecta categories: Weeds revision date: 2022-12-18 12:00 Mallow flowerPhoto by: T.W. Miller Family: Malvaceae Cycle: Various Plant type: Broadleaf Biology Common mallow can be an annual, winter annual, or biennial plant. The plants are spreading from a deep root, with branches reaching from a few inches to almost […]

Weeds: Nightshades – Solanum spp.

Weeds: Nightshades – Solanum spp. categories: Weeds revision date: 2022-12-18 12:00 Cutleaf nightshade with fruitPhoto by: D.G. Swan Family: Solanaceae Cycle: Annual/Perennial Plant type: Broadleaf Biology Nightshades are annual or perennial taprooted plants that spread by seeds. They usually have spreading, branched stems to three feet tall. The alternate leaves are broad with pointed tips. […]

Weeds: Oxalis (Creeping woodsorrel) – Oxalis corniculata

Weeds: Oxalis (Creeping woodsorrel) – Oxalis corniculata categories: Weeds revision date: 2022-12-18 12:00 Woodsorrel leaves and flowerPhoto by: J.A. Kropf Family: Oxalidaceae Cycle: Perennial Plant type: Broadleaf Biology Creeping woodsorrel is a prostrate plant, initially growing from a slender taproot. Branches lie flat on the ground, rooting at the nodes to form new plants. The […]

Weeds: Parrotfeather and Eurasian watermilfoil – Myriophyllum spp.

Weeds: Parrotfeather and Eurasian watermilfoil – Myriophyllum spp. categories: Weeds revision date: 2022-12-18 12:00 Partotfeather frondsPhoto by: T.W. Miller Family: Haloragaceae Cycle: Perennial Plant type: Broadleaf aquatic Biology These rhizomatous perennials exhibit an annual pattern of growth. In the spring, shoots begin to grow rapidly from overwintering rhizomes as water temperatures increase. Rhizomes function as […]

Weeds: Pineappleweed – Matricaria discoidea

Weeds: Pineappleweed – Matricaria discoidea categories: Weeds revision date: 2023-01-10 12:00 Pineappleweed heads and leavesPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Annual Plant type: Broadleaf Biology Pineappleweed grows to over one foot in height, with leaves finely divided into narrow, feathery segments. Cone-shaped or rounded yellow-greenish flowers are produced singly at the ends of […]

Weeds: Plantain (Broadleaf, Buckhorn) – Plantago spp.

Weeds: Plantain (Broadleaf, Buckhorn) – Plantago spp. categories: Weeds revision date: 2022-12-18 12:00 Broadleaf plantainPhoto by: R. Parker Family: Plantaginaceae Cycle: Perennial Plant type: Broadleaf Biology Broadleaf plantain leaves are all basal, forming a low-growing rosette. Broadleaf plantain bears many fibrous roots, from which new plants can occasionally arise. The crown of broadleaf plantain is […]

Weeds: Poison hemlock – Conium maculatum

Weeds: Poison hemlock – Conium maculatum categories: Weeds revision date: 2022-12-18 12:00 Poison hemlock leavesPhoto by: T.W. Miller Family: Apiaceae (Umbelliferae) Cycle: Biennial Plant type: Broadleaf Biology Seedling poison hemlock plants are rosettes of finely divided, fern-like leaves which closely resemble carrot leaves. Mature plants grow six to eight or more feet tall from a […]

Weeds: Poison ivy and Poison oak – Toxicodendron spp. (Rhus spp.)

Weeds: Poison ivy and Poison oak – Toxicodendron spp. (Rhus spp.) categories: Weeds revision date: 2022-12-18 12:00 Poison ivy leavesPhoto by: J.A. Kropf Family: Anacardiaceae Cycle: Perennial Plant type: Broadleaf Biology Western poison ivy (Toxicodendron rydbergii) is a woody shrub or occasionally a climbing woody vine that may reach 3 to 9 feet. Pacific poison […]

Weeds: Pokeweed: Phytolacca americana

Weeds: Pokeweed: Phytolacca americana categories: Weeds revision date: 2022-12-18 12:00 Pokeweed plantPhoto by: K. Volkov Family: Phytolaccaceae Cycle: Perennial Plant type: Broadleaf Biology Pokeweed is a shrub-like herbaceous perennial. It can grow quickly to a height of up to 10′ in one year. The central stem bears egg-shaped leaves which can range from 6″-12″ in […]

Weeds: Prickly lettuce (China lettuce) – Lactuca serriola

Weeds: Prickly lettuce (China lettuce) – Lactuca serriola categories: Weeds revision date: 2023-01-02 12:00 Prickly lettuce leavesPhoto by: R. Parker Family: Asteraceae (Compositae) Cycle: Annual/Biennial Plant type: Broadleaf Biology Prickly lettuce grows from one to five feet tall from a large taproot. The sap is milky. Seedling plants have slightly lobed leaves with spines on […]

Weeds: Prostrate knotweed – Polygonum aviculare

Weeds: Prostrate knotweed – Polygonum aviculare categories: Weeds revision date: 2022-12-18 12:00 Prostrate knotweed leavesPhoto by: R. Parker Family: Polygonaceae Cycle: Annual Plant type: Broadleaf Biology Prostrate knotweed is a low-growing plant with wiry stems and a thin taproot. Plants branch extensively at the base, with branches lying along the ground but not rooting. The […]

Weeds: Puncturevine (Tackweed, Goathead) – Tribulus terrestris

Weeds: Puncturevine (Tackweed, Goathead) – Tribulus terrestris categories: Weeds revision date: 2022-12-18 12:00 PuncturevinePhoto by: R. Parker Family: Zygophyllaceae Cycle: Annual Plant type: Broadleaf Biology Puncturevine is a prostrate plant growing from a taproot. Above ground, the branching, trailing stems grow one to six feet and are green to reddish in color. Leaves are opposite. […]

Weeds: Purple deadnettle (Red deadnettle) – Lamium purpureum

Weeds: Purple deadnettle (Red deadnettle) – Lamium purpureum categories: Weeds revision date: 2022-12-18 12:00 Purple deadnettle flowersPhoto by: C.R. Foss Family: Lamiaceae (Labiatae) Cycle: Annual Plant type: Broadleaf Biology Purple deadnettle has the square stems and opposite leaves characteristic of most plants in the mint family. Plants usually branch from the spreading base. Leaves mostly […]

Weeds: Purple loosestrife (Purple lythrum) – Lythrum salicaria

Weeds: Purple loosestrife (Purple lythrum) – Lythrum salicaria categories: Weeds revision date: 2022-12-18 12:00 Purple loosestrife in bloomPhoto by: N.R. Ness Family: Lythraceae Cycle: Perennial Plant type: Broadleaf Biology Purple loosestrife is an erect plant growing six to eight feet tall from a woody, rhizomatous root system. The original plant spreads to form a large, […]

Weeds: Purslane, common – Portulaca oleracea

Weeds: Purslane, common – Portulaca oleracea categories: Weeds revision date: 2023-01-02 12:00 Common purslane succulent leaves and flowerPhoto by: D.G. Swan Family: Portulacaceae Cycle: Annual Plant type: Broadleaf Biology Common purslane reproduces by seeds, but it can also root from the stems or stem fragments which contact the soil. Common purslane is usually a prostrate […]

Weeds: Quackgrass – Elymus repens (Elytrigia repens, Agropyron repens)

Weeds: Quackgrass – Elymus repens (Elytrigia repens, Agropyron repens) categories: Weeds revision date: 2022-12-18 12:00 QuackgrassPhoto by: D.G. Swan Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Biology Quackgrass is a perennial grass which spreads by both seeds and rhizomes, forming dense clumps if left unchecked. The spreading rhizomes are typically pale yellow in color […]

Weeds: Red sorrel (Sheep sorrel) – Rumex acetosella

Weeds: Red sorrel (Sheep sorrel) – Rumex acetosella categories: Weeds revision date: 2022-12-18 12:00 Red sorrel leavesPhoto by: T.W. Miller Family: Polygonaceae Cycle: Perennial Plant type: Broadleaf Biology Red sorrel has a creeping root system and spreads aggressively by underground roots and rhizomes. The upright, somewhat woody stems grow to a height of 1/2 to […]

Weeds: Redroot pigweed (Rough pigweed) – Amaranthus retroflexus

Weeds: Redroot pigweed (Rough pigweed) – Amaranthus retroflexus categories: Weeds revision date: 2022-12-18 12:00 Redroot pigweedPhoto by: D.G. Swan Family: Amaranthaceae Cycle: Annual Plant type: Broadleaf Biology Redroot pigweed is a coarse, erect plant, growing two to three feet tall. The lower stems and branches and the upper portion of the taproot are frequently red […]

Weeds: Redstem filaree (Stork’s bill, Crane’s bill) – Erodium cicutarium

Weeds: Redstem filaree (Stork’s bill, Crane’s bill) – Erodium cicutarium categories: Weeds revision date: 2022-12-18 12:00 Redstem filaree fruit and flowersPhoto by: R. Parker Family: Geraniaceae Cycle: Annual Plant type: Broadleaf Biology Redstem filaree is typically a winter annual (sometimes a biennial) growing from a rosette. The one- to two-foot stems may be low and […]

Weeds: Reed canarygrass – Phalaris arundinacea

Weeds: Reed canarygrass – Phalaris arundinacea categories: Weeds revision date: 2022-12-18 12:00 Reed canarygrass emerging in springPhoto by: B.M. Johnson Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Biology An aggressive plant, reed canarygrass grows from a large root system. It spreads rapidly by seeds and rhizomes to form large, dense patches, effectively crowding out […]

Weeds: Russian thistle (Tumbleweed) – Salsola tragus (S. iberica, S. kali)

Weeds: Russian thistle (Tumbleweed) – Salsola tragus (S. iberica, S. kali) categories: Weeds revision date: 2022-12-18 12:00 Russian thistle seedlingPhoto by: J.A. Kropf Family: Chenopodiaceae Cycle: Annual Plant type: Broadleaf Biology Russian thistle is a densely branched plant from an extensive root system. Young plants have soft, long, string-like leaves. As the plant matures, leaves […]

Weeds: Ryegrass, annual (Italian ryegrass) – Lolium perenne ssp. multiflorum

Weeds: Ryegrass, annual (Italian ryegrass) – Lolium perenne ssp. multiflorum categories: Weeds revision date: 2022-12-18 12:00 Ryegrass spikeletsPhoto by: T.W. Miller Family: Poaceae (Graminae) Cycle: Annual Plant type: Grass Biology Annual ryegrass is upright, growing in clumps often reaching four feet tall. The flat leaf blades are shiny and about 1/8 to 1/4 inch wide. […]

Weeds: Salsify (Goatsbeard) – Tragopogon spp.

Weeds: Salsify (Goatsbeard) – Tragopogon spp. categories: Weeds revision date: 2022-12-18 12:00 Salsify flowerPhoto by: R. Parker Family: Asteraceae (Compositae) Cycle: Biennial Plant type: Broadleaf Biology Salsify plants are somewhat grass-like in appearance, with slender, pointed leaves which may be as long as twelve inches. The juice is milky. Young plants are low-growing. More mature […]

Weeds: Scotch broom – Cytisus scoparius

Weeds: Scotch broom – Cytisus scoparius categories: Weeds revision date: 2023-01-02 12:00 Scotch broom flowersPhoto by: T.W. Miller Family: Fabaceae (Leguminosae) Cycle: Perennial Plant type: Broadleaf Biology Scotch broom is an aggressive, woody shrub reaching up to ten feet in height. The slim, angular, green branches are typically upright. Many branches are leafless. When present, […]

Weeds: Shepherd’s-purse – Capsella bursa-pastoris

Weeds: Shepherd’s-purse – Capsella bursa-pastoris categories: Weeds revision date: 2023-01-02 12:00 Shepherd’s-purse flowers and fruitsPhoto by: T.W. Miller Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Biology Shepherd’s-purse is an annual or winter annual (sometimes a biennial) plant with a thin taproot. The leaves are primarily in a basal rosette and may have smooth edges […]

Weeds: Smartweeds – Polygonum spp.

Weeds: Smartweeds – Polygonum spp. categories: Weeds revision date: 2023-01-02 12:00 Smartweed leavesPhoto by: J.A. Kropf Family: Polygonaceae Cycle: Annual/Perennial Plant type: Broadleaf Biology Smartweeds are typically annual weeds with erect or spreading stems up to 3 feet long. The leaves are alternate, attaching to the erect or sprawling stems at enlarged nodes. Many smartweeds […]

Weeds: Sowthistle, annual and perennial – Sonchus oleraceus, Sonchus arvensis

Weeds: Sowthistle, annual and perennial – Sonchus oleraceus, Sonchus arvensis categories: Weeds revision date: 2023-01-09 12:00 Annual sowthistle flower headsPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Annual Plant type: Broadleaf Biology Annual sowthistle grows upright and can reach from one to four feet tall. The lower leaves have a stalk while the upper leaves […]

Weeds: Speedwells – Veronica spp.

Weeds: Speedwells – Veronica spp. categories: Weeds revision date: 2022-12-28 12:00 Speedwell foliage and flowers close-upPhoto by: P.R. Corpuz Family: Scrophulariaceae Cycle: Annual/Perennial Plant type: Broadleaf Biology Three of the speedwell species common in the Pacific Northwest are very similar in appearance. Ivyleaf speedwell (Veronica hederifolia), Persian speedwell (V. persica), and creeping speedwell (V. filiformis) […]

Weeds: Spurges (Prostrate spurges) – Chamaesyce spp. (Euphorbia spp.)

Weeds: Spurges (Prostrate spurges) – Chamaesyce spp. (Euphorbia spp.) categories: Weeds revision date: 2022-12-18 12:00 Prostrate spurge with flowersPhoto by: D.G. Swan Family: Euphorbiaceae Cycle: Annual Plant type: Broadleaf Biology There are four prostrate weedy spurges that are common in the western United States. All four species are annual plants with opposite leaves and milky […]

Weeds: Stinging nettle – Urtica dioica

Weeds: Stinging nettle – Urtica dioica categories: Weeds revision date: 2022-12-18 12:00 Stinging nettle flowersPhoto by: R. Parker Family: Urticaceae Cycle: PerennialBroadleaf Plant type: Biology Stinging nettles are typically erect, slender plants reaching two to nine feet high. The opposite leaves are coarsely toothed and often about twice as long as broad. Some varieties have […]

Weeds: St. Johnswort, common (Goatweed, Klamathweed) – Hypericum perforatum

Weeds: St. Johnswort, common (Goatweed, Klamathweed) – Hypericum perforatum categories: Weeds revision date: 2022-12-18 12:00 St. Johnswort in bloomPhoto by: D.G. Swan Family: Clusiaceae (Guttiferae) Cycle: Perennial Plant type: Broadleaf Biology Common St. Johnswort is an erect shrubby plant one to three feet high arising from a taproot. Many stems arise from the base of […]

Weeds: Tansy ragwort – Senecio jacobaea

Weeds: Tansy ragwort – Senecio jacobaea categories: Weeds revision date: 2023-01-02 12:00 Tansy ragwortPhoto by: T.W. Miller Family: Asteraceae (Compositae) Cycle: Biennial Plant type: Broadleaf Biology Tansy ragwort is a biennial or short-lived perennial spreading by seeds. In lawns, regular mowing may maintain it in a non-flowering perennial form. First-year rosettes have a cluster of […]

Weeds: Tumblemustard (Jim Hill mustard) – Sisymbrium altissimum

Weeds: Tumblemustard (Jim Hill mustard) – Sisymbrium altissimum categories: Weeds revision date: 2022-12-18 12:00 Tumblemustard in bloom image 1Photo by: J.A. Kropf Family: Brassicaceae (Cruciferae) Cycle: Annual Plant type: Broadleaf Biology Tumblemustard grows 2-5 feet tall. Seedling plants are low-growing rosettes of deeply lobed leaves. Mature plants have stems that are simple below, and many-branched […]

Weeds: Velvetgrass (Common velvetgrass) – Holcus lanatus

Weeds: Velvetgrass (Common velvetgrass) – Holcus lanatus categories: Weeds revision date: 2022-12-18 12:00 Velvetgrass floweringPhoto by: T.W. Miller Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Biology Velvetgrass is a perennial reaching one to three feet high (if unmowed). Typically growing in small, dense clumps, velvetgrass may also spread to form large clumps, especially in […]

Weeds: Velvetleaf – Abutilon theophrasti

Weeds: Velvetleaf – Abutilon theophrasti categories: Weeds revision date: 2022-12-18 12:00 VelvetleafPhoto by: J.A. Kropf Family: Malvaceae Cycle: Summer annual Plant type: Broadleaf Biology Velvetleaf is an annual weed that typically grows between three and seven feet tall. Broad, heart-shaped leaves (up to five inches wide) alternate on the upright, branching stems. Five to seven […]

Weeds: Water primrose – Ludwigia uruguayensis (L. hexapetala)

Weeds: Water primrose – Ludwigia uruguayensis (L. hexapetala) categories: Weeds revision date: 2022-12-18 12:00 Water primrose with flowersPhoto by: Washington Noxious Weed Board slide collection Family: Onagraceae Cycle: Perennial Plant type: Broadleaf aquatic Biology Water primrose is a perennial aquatic herb. Stems sprawl or grow horizontally to erect on water or mud, rooting freely at […]

Weeds: Waterhemlock, western – Cicuta douglasii

Weeds: Waterhemlock, western – Cicuta douglasii categories: Weeds revision date: 2022-12-18 12:00 Western waterhemlock flower clustersPhoto by: R. Parker Family: Apiaceae (Umbelliferae) Cycle: Perennial Plant type: Broadleaf Biology Western waterhemlock begins growth in the spring. The tall, branching plants reach three to seven feet high by late spring to early summer, when flowering begins. The […]

Weeds: Wild carrot (Queen Anne’s lace) – Daucus carota

Weeds: Wild carrot (Queen Anne’s lace) – Daucus carota categories: Weeds revision date: 2022-12-18 12:00 Queen Anne’s Lace flowersPhoto by: Jrosenberry1 Creative Commons Alike 4.0 Family: Apiaceae Cycle: Biennial Plant type: Broadleaf Biology Wild Carrot (also known as Queen Anne’s Lace) is an upright, tap rooted herb, reaching 1 to 4 feet tall. It may […]

Weeds: Yellow nutsedge – Cyperus esculentus

Weeds: Yellow nutsedge – Cyperus esculentus categories: Weeds revision date: 2022-12-18 12:00 Yellow nutsedgePhoto by: Washington Noxious Weed Board slide collection Family: Cyperaceae Cycle: Perennial Plant type: Broadleaf Biology Yellow nutsedge is an aggressive, creeping perennial that resembles a grass but has triangular stems. Plants range in height from 6 to 30 inches tall. True […]