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Yellow Starthistle
Yellow Starthistle  

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, 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.

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