Dicotyledon | Literature for Bidens pilosa
Wagner et al., 1990, 1999; Lorence & Wagner, 2020. |
Asteraceae -- The Sunflower Family | Bibliography |
Bidens pilosa | |
Common name(s): beggartick, ko`oko`olau, ko`olau, Spanish needle, ki, ki nehe, ki pipili, nehe |
General Information | ||
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Distribution | Native to tropical America, but now a pantropical weed.In the Hawaiian Islands, naturalized on Midway, Ni`ihau, Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i. | |
Habit |
Erect, annual herb, 0.3‒1.8 m tall. |
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Leaves |
Leaves pinnately compound, usually 2.5‒13.5 cm long including petiole, leaflets (1‒)3‒5(‒7). |
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Flowers |
Heads 21‒42 in compound cymes terminating main stem and lateral branches, discoid and 0.5‒1 cm in diameter or radiate and < 10 mm in diameter excluding ray florets, peduncle 1‒9 cm long; outer involucral bracts spatulate tipped, 2.5‒5 mm long; ray florets absent or 4‒7 per head, rays white or pale yellow, 2‒8 mm long; disk florets 35‒75 per head, perfect, corollas yellow; pappus of 2‒3(‒5) barbed awns 1‒2 mm long. |
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Fruit |
Achenes dark brown or black, straight, wingless, 8‒16 mm long, setose. |
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Chromosomes |
2n = 24, 36, 46, 48, 72, ca. 76. |
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Contributor |
Nancy Khan |