L., Sp. Pl. 904 (1755).
Derivation: Greek helios, the sun; anthos, flower; as the flower heads turn toward the sun.
Synonymy: Not Applicable
Common name: None
Annual and perennial herbs; leaves cauline, mainly opposite, flat, sessile or petiolate, simple, entire to toothed.
Capitula large, terminal, solitary or few in a cyme, pedunculate, heterogamous, radiate; involucres hemispherical, 3-seriate; bracts herbaceous; receptacle flat, pitted, with folded deciduous scales; ray florets uniseriate, female, fertile, ligulate; disk florets bisexual, fertile, tubular, pentamerous; corolla campanulate; anthers obtuse at the base, with a deltoid appendage at the apex; style branches linear, with narrowly deltoid terminal appendages, with hairs on the outer faces.
Achenes obovate to oblong, compressed; pappus of caducous scales.
About 67 species in North and South America; 1 naturalised in Australia.
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