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 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 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 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 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 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 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 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. 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 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 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 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 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 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 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 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 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 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 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. 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 […]
