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   Western Whorled Milkweed Asclepias subverticillata   Adult Native to the western United States, western whorled milkweed is found in rangelands, pastures, along roadsides, and field edges. It reproduces by seed and lateral root systems. This plant is toxic. Flower This single-stemmed perennial grows one to three feet tall, anchored by deep vertical and lateral root systems. As implied by its name, the leaves are whorled (clustered) around the stem, three or four leaves per node. The leaves are two to five inches in length and are very narrow. Flowers are white with a green tint, borne in clusters. Seed pods are two to four inches long containing flat brown seeds with white silky hairs. 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