Arthraxon

Perennial or annual, often trailing. Leaf blade linear-lanceolate to ovate-lanceolate, cordate and amplexicaul at base; ligule an unfringed to fringed membrane (rarely). Inflorescence of slender racemes, subdigitate, internodes and pedicels filiform to linear; spikelets usually paired, secund, in long-short combinations: one sessile, the other pedicelled, pedicels free from rachis. Sessile spikelet laterally compressed, falling with glumes; glumes +/- equal in size, dissimilar, awnless; lower glume rounded on back, with or without 2 lateral keels, spinously muricate; upper glume laterally compressed. Florets 2; lower floret sterile, reduced to a hyaline lemma, awnless; upper floret bisexual, lemma less firm than glumes, hyaline, awned from low down on back, awn glabrous, geniculate; callus truncate, inserted into hollow top of internode; palea reduced or 0. Lodicules 2, fleshy, glabrous. Stamens 2 or 3. Ovary glabrous. Caryopsis terete.