| General Information |
| Distribution | Native from southwestern United States south to South America, now a cosmopolitan weed.In the Hawaiian Islands,
naturalized on
Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.
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Habit
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Slender annual herbs 2-7 dm tall, sparsely pubescent with appressed or sometimes spreading hairs.
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Leaves
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Leaves ovate or narrowly ovate, 2-5 cm long, 1-3 cm wide, margins serrulate or entire.
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Flowers
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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.
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Fruit
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Achenes sparsely appressed pubescent or glabrous.
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Chromosomes
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2n = 16, 32, 36
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