Flora of New Zealand Series

Umbels terminal, few- to many-fld, on very short peduncles. Involucral bracts us. free; calyx-teeth prominent, sts petal-like. Disk thick and fleshy. Mericarps subterete or very slightly dorsally compressed, 5-ribbed. Densely tufted herbs, often forming cushionlike masses. Lvs alt., closely imbricate, ± appressed, entire to dissected. A genus of some 70 spp., mainly of southern S. America; the N.Z. sp. widespread in Antarctica.