YELLOW STARTHISTLE (Centaurea solstitialis L.) GROWTH HABIT: Annual, erect, rigid branching stems. LEAVES: Basal leaves deeply lobed, upper leaves not lobed, small, sharply pointed. STEMS: Rigid, covered with a cottony fiber, to 30 inches tall, winged structures. FLOWER: Yellow, terminal, flower bracts are tipped with straw-colored, ¾ inch thorn. ROOTS: Taproot. SEEDS: Smooth, light-colored, often darker mottled, 1/8 inch long, notched just above the base. OTHER: Causes "chewing disease" in horses. |