Weeds: Hedge bindweed – Calystegia sepium (Convolvulus sepium) categories: F-H Weeds revision date: 2024-06-22 08:10 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 […]
Weeds: Henbit – Lamium amplexicaule categories: F-H Weeds revision date: 2024-06-22 08:10 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 […]
Weeds: Herb Robert (Robert geranium, stinky Bob) – Geranium robertianum categories: F-H Weeds revision date: 2024-06-22 08:11 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 […]
Weeds: Horsetails (Scouringrush) – Equisetum spp. categories: F-H Weeds revision date: 2024-06-22 08:11 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 […]
Weeds: Horseweed (Marestail) – Conyza canadensis categories: F-H Weeds revision date: 2024-06-22 08:11 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 […]
Weeds: Knapweeds – Centaurea spp. categories: I-Po Weeds revision date: 2024-06-22 08:12 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 […]
Weeds: Knotweeds (Bohemian, Giant, Japanese, Himalayan) – Polygonum spp. categories: I-Po Weeds revision date: 2024-06-22 08:12 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 […]
Weeds: Kochia – Kochia scoparia categories: I-Po Weeds revision date: 2024-06-22 08:12 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 […]
Weeds: Lambsquarters, common – Chenopodium album categories: I-Po Weeds revision date: 2024-06-22 08:12 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 […]
Weeds: Lesser celandine – Ficaria verna categories: I-Po Weeds revision date: 2024-06-22 08:13 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 […]
Weeds: Liverworts – Several species categories: I-Po Weeds revision date: 2024-06-22 08:13 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 […]
Weeds: Mallow, common (Cheeseweed, Buttonweed) – Malva neglecta categories: I-Po Weeds revision date: 2024-06-22 08:13 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 […]
Weeds: Nightshades – Solanum spp. categories: I-Po Weeds revision date: 2024-06-22 08:14 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 […]
Weeds: Oxalis (Creeping woodsorrel) – Oxalis corniculata categories: I-Po Weeds revision date: 2024-06-22 08:14 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. […]
Weeds: Parrotfeather and Eurasian watermilfoil – Myriophyllum spp. categories: I-Po Weeds revision date: 2024-06-22 08:14 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 […]
Weeds: Pineappleweed – Matricaria discoidea categories: I-Po Weeds revision date: 2024-06-22 08:15 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 […]
Weeds: Plantain (Broadleaf, Buckhorn) – Plantago spp. categories: I-Po Weeds revision date: 2024-06-22 08:15 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 […]
Weeds: Poison hemlock – Conium maculatum categories: I-Po Weeds revision date: 2024-06-22 08:15 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 […]
Weeds: Poison ivy and Poison oak – Toxicodendron spp. (Rhus spp.) categories: I-Po Weeds revision date: 2024-06-22 08:16 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 […]
Weeds: Pokeweed: Phytolacca americana categories: I-Po Weeds revision date: 2024-06-22 08:16 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″ […]
