(nat)
Slender annual herbs 2-7 dm tall, sparsely pubescent with appressed or sometimes spreading hairs. Leaves ovate or narrowly ovate, 2-5 cm long, 1-3 cm wide, margins serrulate or entire. Heads 3-4 mm high, peduncles appressed pubescent or glandular villous; involucral bracts 2-3 mm long; ray florets (3)5(6) per head, rays white, rarely pink, 3-toothed, 1-2 mm long; pappus of ray florets absent or very reduced, that of disk florets consisting of blunt-tipped, fimbriate scales. Achenes sparsely appressed pubescent or glabrous. [2n = 16, 32, 36.] Native from southwestern United States south to South America, now a cosmopolitan weed; in Hawai‘i naturalized in a variety of disturbed habitats, particularly urban areas, trails, open rocky sites, or pastures, 0-1,800 m, on Kaua‘i, 0‘ahu, Maui, Kaho‘olawe, and Hawai‘i. First collected on 0‘ahu in 1909 (Forbes 1054.0, BISH).—Plate 27.