Muhlenbergia monandra Alegría & Rúgolo

Tufted annuals. Culms 4−25 cm tall, 0.3−0.7 mm in diameter near base, erect to decumbent, branching below, glabrous, 2 or 3 glabrous nodes, scaberulous below the nodes; internodes 0.5−9 cm long. Leaf sheaths 0.5−4.7 cm long, usually shorter than the internodes, compressed, mostly glabrous, scaberulous near the summit, margins scarious; ligules 1−3 mm long, hyaline, decurrent, apex truncate to obtuse, lacinate to irregularly dentate; blades (0.5−)1−8 cm long, 0.7−3.6 mm wide, flat or loosely folded, finely pilose above and scabrous below, margins scabrous, apex mostly acuminate, rarely acute. Panicles (0.5−)1−7 cm long, 2−9 mm wide, tightly spiciform, often interrupted below, elliptic to oblong, terminal and axillary, often partially included in the sheath below; primary branches 4−15 mm long, tightly ascending-appressed, verticillate below with 5−10 per node, scabrous; pedicles 0.1−1.2 mm long, shorter than the spikelets, scabrous. Spikelets 3.4−4.6 mm long, 1-flowered, tightly carinate, cleistogamous; glumes 3.5−4.7 mm long, longer than the floret, nearly equal in length, membranous, linear lanceolate, 1-veined, scaberulous along the midvein, apex acuminate, mucronate, the mucro 0.2−0.7 mm long; lemmas 1.5−2.1 mm long, hyaline to membranous, ovate, 3-veined, the lateral veins faint, mottled with irregular plumbeous areas, sparingly appressed pilose, the hairs 0.2−0.4 mm long, apex truncate to obtuse, subapically awned, the awns 1.2−5 mm long, straight; callus pilose; paleas 1.4−2 mm long, hyaline, ovate, sparingly pilose, apex truncate, the veins extending as mucros up to 0.2 mm long; lodicules 0.1−0.2 mm long, truncate; stamen 1, anthers 0.3−0.6 mm long, whitish to yellow. Caryopses 1−1.6 mm long, ovoid, laterally flattened, light brown.

A Peruvian endemic known only from near San Jose de Canta, Peru.