Plants perennial, stoloniferous. Culms 40-100 cm tall, 2-1.5 mm thick, sometimes geniculate at the lower nodes; internodes glabrous, shining.
Leaves: sheaths 5-10 cm, keeled, frequently desnsely pubescent with a micture of short and long hairs, sometimes glabrous, becoming fibrous with age. Auricles 0.5-0.8 mm long, scarcely clasping, very occasionally wit 1-2 long hairs. Ligule 0.2-0.5 mm long, slightly erose; Blade 10-30 cm long, 1-2.5 mm wide, flat, with 9-11 veins; surfaces scabrous over the veins, abaxial surface occasionally with hairs to 0.5 mm long betweeen the veins and near the ligule; margins scabrous.
Inflorescence 10-20 cm long, nodding, with 15-30 spikelets; rachis glabrous on the surfaces, coarsely scabrous on the edges, prolonged 2.5-4.5 mm beyond the base of the distal spikelet; nodes with solitary spikelets; middle internodes 4-7 mm long.
Spikelets solitary, 7-10 mm (excluding the awns), to 15 mm including the awns, longer than the internodes, with 1-3 florets.
Glumes about equal, 3-10 mm long, 0.2-0.3 mm wide, shorter than the adjacent lemma, 1-veined, narrowly canaliculate at the base, become awn-like distally, scabrous. Calluses short, surrounded by short, stiff hairs. Lemmas 8-10 mm long, mostly glabrous, sometimes pruinose, infrequently bifid; awn 5-6.5 mm long. Palea 8-10 mm long, longer than or equal to the lemma, tapering distally; keels straight, coarsely scabrous, intercostal region retuse or exerted.
Lodicules 0.7-0.8 mm long. Anthers 3-3.5 mm long. Caryopses 5-5.5 mm long.
NEW Zealand, narrowly distributed in the northwestern mountains of of South Island.
Tussock grassland and on river terraces at 100-1525 m.
2n =28, HW.
Cleistogamous or chasmogamous.
Stenostachys deceptorix Connor
onnor, H.E. 1994. Indigenous New Zealand Triticeae: Gramineae. New Zealand Jornal of Botany 32: 125-154.