Sensitive Brier (Catclaw Sensitive Brier)
A trailing or creeping perennial of dry areas, entirely covered by hooked barbs. Flowers in ball-shaped heads on long stalks arising from leaf axils; florets many, funnel-shaped, pink to rose-colored, with yellow-tipped stamens protruding. Blooms May–September. Leaves alternate, double-compound, with 13–15 primary divisions that are again divided into 8–16 tiny leaflets (called pinnules). These small leaflets are sensitive to touch and can fold and close like those of the related mimosa tree. Fruit a slender, very prickly pod to 3½ inches long, splitting lengthwise into four parts when mature.