Flora of New Zealand Series

Capitula solitary, or infl. compound. Phyll. in 2 series. outer foliaceous, inner membr.; receptacle ± flat, with chaffy deciduous scales. Ray-florets ligulate, neuter, or absent; disk-florets tubular, perfect. Achenes us. 4-angled, pappus of 2 to 4 barbed bristles. Annual to perennial herbs with opp. lvs. A widespread genus of some 200 spp., mainly of America.