Annual (in ours) or perennial
herbs. Leaves alternate (in ours). Capitula large,
solitary and terminal or laxly corymbose, heterogamous, radiate;
ray florets neuter, yellow; disk florets bisexual, fertile.
Phyllaries 2-3-seriate. green and herbaceous. Receptacular scales
folded, partly enclosing achenes at maturity. Achenes ±
flattened, slightly angled. Pappus of 2(-4) deciduous
bristles. Worldwide: 50 species in N America Zimbabwe: 1 taxon. |
 |