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Bidens mauiensis
Bidens mauiensis(A.Gray) Sherff
Family: Asteraceae
Maui beggarticks
[Bidens awaluana O. Deg., I. Deg. & Sherff, moreBidens mauiensis var. ciliata H. St. John, Bidens mauiensis var. cuneatoides Sherff, Bidens mauiensis var. forbesiana Sherff, Bidens mauiensis var. lanaiensis Sherff, Bidens mauiensis var. media Sherff, Coreopsis mauiensis A.Gray]
[Coreopsis mauiensis A. Gray; Bidens awaluana Degener, I. Degener & Sherff; B. mauiensis var. ciliata St. John; B. m. var. cuneatoides Sherff; B. m. var. forbesiana Sherff; B. m. var. lanaiensis Sherff; B. m. var. media Sherff; Campylotheca mauiensis (A. Gray) Hillebr.] (end) Decumbent perennial herbs 0.1-0.3 m tall. Leaves simple to bipinnately compound and divided into narrow ultimate segments, usually 4-7.5 cm long including petiole, leaflets (1 —)3—5(—7), lanceolate or rhombic to linear, 0.5-5 cm long, 0.2-2.5 cm wide, glabrous or sparsely ubescent on veins, margins serrate. Heads solitary terminating main stem and lateral branches, 2.8-5.3 cm in diameter including ray florets (noticeably smaller on old plants and at end of flowering season), peduncles 10-25 cm long, sparsely pubescent; outer involucral bracts 5-15 mm long, the inner ones distinct; ray florets (5—)7-l 1 per head, sterile, rays yellow, 15-28 mm long, 7-8 mm wide; disk florets 18-42 per head, perfect, corollas yellow; pappus of wide awns decurrent into the wings, 0.5-1.5 mm long, or absent. Achenes brown, straight, winged, 4.5-10 mm long, (1.5—)2—3.8 mm wide, glabrous. [2n = 72*.] Relatively common on coastal bluffs, lithified sand dunes, and in shrub-land vegetation on dry slopes, 50-600 m, on Lanai, Maui, and Kaho‘olawe.—Plate 18. Bidens mauiensis is closely related to B. molokaiensis, but it differs in leaf shape and has very different achenes. The numerous varieties of B. mauiensis that have been described are based on different leaf shapes and sizes of heads. The leaf shapes are genetically controlled but represent poly-morphisms within populations, and the dif-ferences in sizes of heads are environmentally determined. Populations from East Maui and Kaho‘olawe are distinctive in having rather succulent leaves but probably do not warrant segregation on the basis of a single character.
Development of the Consortium of Pacific Herbaria and several of the specimen databases have been
supported by National Science Foundation Grants (BRC 1057303,
ADBC 1304924
and ADBC1115116).
Data Usage Policy. Continued support provided by the Symbiota Support Hub, a domain of iDigBio (NSF Award #2027654).
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