Foug., Obs. Phys.(Paris) 29:55 (1786).
Derivation: Named after Gaillard de Marentonneau, 18th century French patron of botany.
Synonymy: Not Applicable
Common name: None
Annual and perennial herbs; stem terete, herbaceous; leaves alternate, flat, simple.
Capitula terminal, pedunculate, solitary or few, large, heterogamous, radiate; involucre hemispherical; bracts herbaceous, imbricate in 2 or 3 series, becoming reflexed in fruit; receptacle convex, hairy; ray florets uniseriate, neuter, ligulate; disk florets bisexual, fertile, tubular; corolla campanulate, with 5 glandular-pubescent lobes; anthers shortly sagittate at the base, with prominent lanceolate terminal appendages; style branches linear, truncate, with acute hairy terminal appendages.
Achenes terete, villous; pappus of prominent scarious scales tapering into awns.
28 species in North and South America; several species and hybrids are cultivated and 1 occurs as an escape in Australia.
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