Pentameris rupestris Steud.

Tufted perennial 600-1000 mm high; base sparsely hairy; basal sheaths white, shiny, persistent; leaves basal; stalked, crateriform glands on leaves, pedicels and glumes (highly variable in frequency and distribution). Leaf blade to 400 x to 6 mm, expanded or rolled, margins scabrid; sheath mouth with a ring of bristles. Inflorescence usually open, hemispherical, 100 x 90 mm, with ± 300 spikelets; pedicels not obscured by spikelets, glabrous or puberulous; axils hairy. Spikelet 7-8 mm long; glumes acuminate, greenish, glabrous or scaberulous along keels; lemma 3 mm long, hairy all over; lateral awns 0.3 mm long, extending up to glume apices; central awn 10 mm long; palea glabrous; anthers 3 mm long.