Yellow Starthistle (Centaurea solstitialis L.) YELLOW STARTHISTLE(Centaurae 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.FLOWERS: Yellow, terminal, flower bracts are tipped with straw-colored, ¨ú inch torn.ROOTS: Taproot.SEEDS: Smooth, light-colored, often darker mottled, ¨û inch long, notched just above the base.OTHER: Causes ¡°chewing disease¡± in horses.
YELLOW STARTHISTLE
(Centaurae 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.
FLOWERS: Yellow, terminal, flower bracts are tipped with straw-colored, ¨ú inch torn.
ROOTS: Taproot.
SEEDS: Smooth, light-colored, often darker mottled, ¨û inch long, notched just above the base.
OTHER: Causes ¡°chewing disease¡± in horses.