Weeds: Annual bluegrass – Poa annua Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:10 Family: Poaceae (Graminae) Cycle: Annual/Perennial Plant type: Grass Annual bluegrass Photo by: T. Miller 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 […]
Weeds: Barnyardgrass – Echinochloa crus-galli Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:11 Family: Poaceae (Graminae) Cycle: Summer annual Plant type: Grass Barnyardgrass Photo by: J.A. Kropf 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 […]
Weeds: Bentgrass, creeping – Agrostis stolonifera Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:12 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Creeping bentgrass Photo by: B.M. Johnson 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 […]
Weeds: Bermudagrass – Cynodon dactylon Categories: A-B Grasses Weeds Last review date: 2026-06-05 08:14 Family: Poaceae (Graminae) Cycle: Perennial Plant type: Grass Bermudagrass blades Photo by: D.G. Swan 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 […]
Weeds: Birdfoot Trefoil – Lotus corniculatus Categories: A-B Broadleaf Weeds Last review date: 2026-06-05 10:46 Family: Fabaceae Cycle: Perennial Plant type: Broadleaf Birdfoot Trefoil flowers Photo by: Albert Herring CC 2.0 Biology Lotus corniculatus can be identified by its unique shaped leaves that alternate on the main stem, are trifoliate (3 terminal leaflets at the […]
Weeds: Bittercress (Shotweed, Hairy bittercress) – Cardamine hirsuta Categories: A-B Broadleaf Weeds Last review date: 2026-06-05 10:47 Family: Brassicaceae (Cruciferae) Cycle: Winter annual Plant type: Broadleaf Hairy bittercress rosette (1) Photo by: T.W. Miller Biology Little bittercress is a fall/winter-germinating annual species growing to less than five inches tall. Leaves are compound with one large […]
Weeds: Bittersweet nightshade (European bittersweet) – Solanum dulcamara Categories: A-B Broadleaf Weeds Last review date: 2026-06-05 10:48 Family: Solanaceae Cycle: Perennial Plant type: Broadleaf Bittersweet nightshade fruits Photo by: T.W. Miller Biology Bittersweet nightshade is a trailing to climbing, viny plant with stems reaching up to ten feet. The dark green leaves are alternate on […]
Weeds: Black medic – Medicago lupulina Categories: A-B Broadleaf Weeds Last review date: 2026-06-05 11:12 Family: Fabaceae (Leguminosae) Cycle: Annual Plant type: Broadleaf Black medic stem and leaves Photo by: T.W. Miller Biology Black medic is very clover-like in appearance and is sometimes called Japanese clover. Leaves are alternate on the stems and divided into […]
Weeds: Blackberry (Himalayan, Evergreen, Pacific) – Rubus spp. Categories: A-B Broadleaf Weeds Last review date: 2026-06-05 10:49 Family: Rosaceae Cycle: Perennial Plant type: Broadleaf Blackberry fruit Photo by: T.W. Miller 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. […]
Weeds: Blue mustard (Purple mustard, Tenella mustard) – Chorispora tenella Categories: A-B Broadleaf Weeds Last review date: 2026-06-05 11:12 Family: Brassicaceae (Cruciferae) Cycle: Winter annual Plant type: Broadleaf Blue mustard with flowers Photo by: J.A. Kropf Biology Blue mustard is a leafy, taprooted winter annual. Plants branch primarily from the base, with some branching of […]
