2n = 28

Long-rhizomatous dioecious perennial, 10-30-(60) cm, with narrow, involute, greyish green, stiffly erect to curved leaves, often equalling the culms; branching extravaginal; leaf-blades persistent. Leafsheath light greenish to brownish grey or stramineous, smooth, ± shining, submembranous, keeled above, open to near base, with several prominent nerves. Ligule 0.5-1.0-(1.5) mm, entire, truncate or sometimes rather abruptly tapered centrally, abaxially minutely pubescent. Leaf-blade (2.5)-4.5-18.5-(28) cm × 0.5-1 mm diam., involute, abaxially glabrous, adaxially minutely pubescent; tip acicular. Culm 4.5—25—(53) cm, internodes smooth, sparsely minutely scabrid below panicle. Panicle (2)—3—6 .5—(8) cm, with short ascending branches and close-set spikelets; rachis and branches smooth or with sparse prickle-teeth. Spikelets 4.5-8.5-(10) mm, (2)-3-6- (7)-flowered, green to stramineous, often purple-suffused. Glumes subequal, glabrous; lower 2.5-4 mm, 1-nerved, elliptic-lanceolate, acute to acuminate, upper 3-5.5 mm, 3-nerved, elliptic-ovate, acute to subobtuse. Lemma 4—5 mm, 5- nerved, inner lateral nerves sometimes faint, elliptic-ovate, acute, glabrous apart from a few hairs at base of keel and outer lateral nerves. Palea 3-3.5 mm, narrower than lemma; keels with sparse minute prickle-teeth in upper ½–¾ or rarely smooth, occasionally keels and lower ½ of interkeel with sparse minute hairs. Callus with tufts of long fine hairs below lemma nerves. Rachilla <1 mm, glabrous. Anthers of male flowers 2–3 mm; of female flowers 0.2–1 mm, sterile. Female flowers: lodicules 0 .3–0 .6 mm; ovary 0.5–0.9 mm; stigma-styles 1.2– 2.6 mm; caryopsis 1.5–2.5 × 0.5–0.8 mm; embryo 0.4–0.6 mm. Endemic.

Gramen dioecium Poae sudicolae affine rhizomatibus longissimis, foliisque involutis griseoviridibus, differt autem culmis folia plus minusve aequantibus non valde superantibus, laminis foliorum adaxialiter dense pubescentibus, glumis inferioribus saepe acuminatis, spiculis pluribus et lemmatibus omnino glabris supra pilos densos ad nervorum basem implexos.

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