Annual herbs (in ours),
strongly aromatic when crushed. Leaves opposite or
alternate, pinnatisect, conspicuously gland-dotted; lobes
narrowly elliptic or lanceolate; margin serrate. Capitula
solitary or in dense corymbs, distinctly stalked,
heterogamous, radiate; ray florets female; disk florets bisexual.
Phyllaries in 1 series, connate for most of their
length, gland-dotted. Ray florets few, female. Rays yellow,
orange or brown. Achenes narrowly cylindric-turbinate. Pappus of
1-3 elongate setae and 7-9 shorter membranous scales with ciliate
margins. Worldwide: c. 50 species in tropical and warm parts of America with 1 species in Africa Zimbabwe: 2 taxa. |
|