Bidens pilosa L.
Show more
Details
Bidens pilosa L., Sp. Pl. 832 (1753)
Bidens pilosa L.
Nomenclature
L.
L.
1753
832
ICN
Bidens pilosa L.
species
Bidens pilosa
Classification
Vernacular names
Descriptions
Bidens pilosa L.
Erect or spreading herb up to 6dm. or more tall; branches and branchlets angled. Lvs on petioles up to c. 3 cm. long; lamina simple, 2-5 cm. long, about ovate-lanceolate, thin, acute to acuminate, serrate. Sts some or all lvs are pinnately cut into 3-5 segs. Capitula up to ± 15 mm. diam., on long slender peduncles. Phyll. ± 6·5 mm. long. Ray-florets few, short, or 0. Achenes almost black, 4-angled, striate, c. 4-5 mm. long; bristles us. 4, up to c. 2 mm. long.
Bidens pilosa L.
Erect annual or short-lived perennial, 10-100 cm tall. Stems glabrous or sparsely hairy, ribbed, much-branched. Lvs glabrous to moderately hairy especially below, ciliate, petiolate, usually 3-foliolate with terminal leaflet larger, sometimes simple and not lobed to 3-lobed; leaflets sessile or shortly petiolulate, ovate to lanceolate, evenly serrate, acute to acuminate, (1)-2-10-(25) cm long. Upper cauline lvs becoming smaller, shortly petiolate, and more often simple and not lobed or 3-lobed. Capitula c. 6-10 mm diam. Outer involucral bracts 7-9, foliaceous, ciliate, linear to narrowly oblong-obovate, 3-6 mm long; inner bracts many, membranous, triangular to subulate, 4-6 mm long, with dark lined centre and pale margins. Receptacular scales similar to inner bracts but narrower. Florets usually all ☿, tubular, yellow-orange, sometimes c. 5 white ray florets present. Achenes flattened or 3-(4)-angled, ± linear, ribbed, dark brown, usually glabrous except for ribs ciliate near apex, sometimes with scattered hairs elsewhere, 5-9 mm long; awns mostly 3, sometimes 2, rarely 4, sometimes unequal, (0.5)-1.5-2.5 mm long.
Taxonomic concepts
Bidens pilosa L.
Bidens pilosa L.
Bidens pilosa L.
Collections
Metadata
a257c6f6-35de-426d-98cb-a0d5d6ff8664
scientific name
Names_Plants
1 January 2000
28 April 2006