Erect or prostrate herbs of wet places. Leaves opposite, sessile or nearly so. Capitula axillary, sessile or subsessile, heterogamous, radiate. Ray-florets female, fertile, in 1-several rows; disk florets bisexual and fertile or the innermost sterile. Phyllaries 4, leafy, in 2 series of opposite pairs. Rays short, broad, 3-4-dentate; disk-florets tubular, 5-lobed. Achenes oblong, usually flattened, surrounded by the persistent receptacular scales. Pappus 0. Worldwide: 10 species in warm regions of the world Zimbabwe: 1 taxon. |
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