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Electronic Flora of South Australia genus Fact Sheet

Family: Compositae
Helianthus

Citation: 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

Description:
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.

Distribution:  About 67 species in North and South America; 1 naturalised in Australia.

Biology: No text

Author: Not yet available


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