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 […]
