Umbels simple, few-fld, on slender peduncles; involucral bracts few, minute; calyx-teeth small, petals white. Fr. globose to cylindric, sts ± laterally compressed. Mericarps with 3-6 ribs; dorsal thin, lateral rather thick. Vittae 3-8, between ribs. Small glab. creeping herbs rooting at nodes. "Phyllodes" us. clustered at nodes, sheathing at base; produced above into a cylindric or spathulate, fistular, septate axis. Genus of some 15 spp. of N. and S. America, Australia, Tasmania. The 3 known N.Z. spp. are endemic.
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