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   Jointed Goatgrass Aegilops cylindrica   Adult A winter annual, jointed goatgrass grows 15 to 30 inches tall. It may have one or more upright stems. Segmented Seedhead The seedheads are long and slender and have a segmented appearance. Seed Flower and seed production take place from late spring to mid summer. Early Summer Weed Infestation As the seeds mature, the plant turns from green to a reddish or tan color. Late Summer Weed Infestation Lower Stem has hairs Leaf blades are one-eighth to one-quarter inch wide and have fine margin hairs near the stem juncture. 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