Bermudagrass Johnsongrass Medusahead Quackgrass Field Bindweed Hoary Cress Diffuse Knapweed Russian Knapweed Spotted Knapweed Squarrose Knapweed Purple Loosestrife Perennial Pepperweed Leafy Spurge Yellow Starthsitle Canada Thistle Musk Thistle Scotch Thistle Dyer's Woad Back to main weeds page   Black Henbane Hyoscyamus niger   Rosette Leaves have pointed lobes and prominent veins. Adult As either an annual or biennial, black henbane grows one to three feet tall. Flower Off-white flowers with purple centers and veins are one to two inches wide. Bloom occurs in late spring. Weed Infestation Black henbane is a native plant of Europe commonly found in waste areas, pastures, along rights-of-way, and fence lines. It is poisonous to both animals and humans. However, it has medical use in controlled circumstances. Pineapple Shaped Seedpods Each flower produces a pineapple shaped fruit. Each fruit has five lobes and contains hundreds of tiny black seeds. Long taproot Back to main weeds page   Buffalobur Common Burdock Camelthorn Goatsrue Jointed Goatgrass Poison Hemlock Black Henbane Houndstongue Blue-Flowering Lettuce Western Whorled Milkweed Silverleaf Nightshade Yellow Nutsedge Puncturevine Russian-Olive Saltcedar St. Johnswort Bull Thistle Dalmatian Toadflax Yellow Toadflax Velvetleaf