Plants perennial, with long stolons. Culms 35-80 cm tall, 0.7-1.5 mm thick; nodes 2-5, inconspicous, glabrous; internodes glabrous.
Leaves: sheaths 5-10 cm long, retrorsely hairy, the hairs about 0.5 mm long, or glabrous. Auricles absent or 0.15-0.25 mm long. Ligules 0.5-1 mm long lacerate. Blades 15-25 cm long, 1.5-2 mm wide, flat, with 6-12 veins; abaxial surface with conspicuous midrib, usually glabrous, occasionally with hairs 1 mm long adjacent to the veins or retrorselyscabridulous; adaxial surface usually scabrous on the veins, occasionally with hairs to 0.5 mm long; margins smooth or scabrous.
Inflorescences 8-15 cm long, nodding or drooping, with 10-25 solitary spikelets; rachis with smooth surfaces and scabrous edges, extending (0.25)3-6 mm beyond the distal spikelet; middle internodes 2.5-6 mm long.
Spikelets solitary, not pedicellate, 8-12 mm long, with 1-2 florets; disarticulation below the florets.
Glumes about equal, 2-6 mm long, 0.2-0.5 mm wide, awnlike, 1-veined, scabrous. Calluses 0.5-0.75 mm long, flat, almost glabrous. Lemmas 6.5-9 mm long, mostly glabrous, scabridulous near the tip and along the base of the lateral veins, tip bifid, with a scabrous awn 0.5-1 mm long. Paleas 6.5-7 mm long, shorter than the lemma body; keels scabrous, teeth 0.5-1 mm long; intercostal region bifid.
Lodicules 0.75-1.75 mm, lobed or entire. Anthers 1.6-2.6 mm long, often retaine don the caryopsis. Caryopses about 4 mm long.
NEW ZEALND: North Island, Reparoa Bog; South Island: Almost throughout, not Nelson, Buller, and Westland; Stewart Island.
Grasslands, often in flushed sites, at sea level to 1300 m.
2n = 28, HW
Chasmogamous and cleistogamous.
Stenostachys laevis (Petrie) Connor
The link is to TROPICOS which also provides information on the basionym and synonyms.
Connor, H.E. 1994. Indigenous New Zealand Triticeae: Gramineae. New Zealand Jornal of Botany 32: 125-154.