Perennial herbs, prostrate (rarely annual and erect, but not in Australia). Leaves simple, opposite, petiolate or sessile, often lobed, entire to serrate or shortly dentate, 3-veined; base shortly attenuate. Capitula terminal, appearing axillary in upper leaf, solitary or in clusters of 2–4, on long peduncles, radiate; involucral bracts in 2–4 unequal series, the outermost narrower, indurate or stramineous at base, green tipped, the innermost entirely stramineous; receptacle paleate; paleae linear to lanceolate or oblanceolate, often slightly lobed, rigid, keeled, sparsely hairy. Ray florets female and fertile, 2-or 3-lobed; ligule yellow-orange or yellow. Disc florets bisexual (rarely male but not in Australia); corolla 5-lobed, yellow to yellow-orange; anther sacs black. Achenes often dimorphic, tuberculate, lacking awns, and wings, body of achene sometimes extended apically and concealing pappus. Pappus an erose corona of connate scales seated on a rostrum.
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