Tricostularia undulata (Thwaites) J.Kern

Forming dense tussocks; roots thick. Stems slender, rigid, obtusely trigonous, sulcate-striate, smooth, leafy only at the incrassate base, 30-90 cm by 1-2 mm. Leaves basal, shorter than to as long as the stems, rigid, strongly ribbed, obtusish, deeply chan-nelled because of the involute margins, scaberulous, 1-3 mm wide. Panicle much branched, rather diffuse to dense, consisting of 4-5 distant to approximate fascicles of branches. Lowest bract similar to the leaves, shorter to slightly longer than the inflorescence, upper ones decreasing in length; sheaths short, reddish brown. Branches 2-3 together, un-equal, more or less exserted from the sheath, rigid, flexuous, compressed, scaberulous. Spikelets almost sessile in clusters of 2-8, 1-flowered, 4-5 by 1-1½ mm. Glumes 4, oblong-lanceolate, acute, the upper 4-5 mm long, the lower 2 much shorter, c. 2 mm. Perianth-scales (3-)6, lanceolate to linear-lanceolate, densely covered with white antrorse short hairs, usually ½ mm long, rarely about as long as the nut. Anthers c. 2 mm; appendage of the connective triangular to oblong. Nut obtusely trigo-nous, slightly reticulate-rugulose, castaneous to blackish, with 3 whitish ribs, hispidulous at the top, 1⅓-1½ by ⅔-4/5 mm.

In open sandy heaths, savannah-forests, slightly damp spots on sandstone rocks, 0-1600 m.