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Spikelets

Spikelet, abaxial view

Description

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.

Distribution

NEW ZEALND: North Island, Reparoa Bog; South Island: Almost throughout, not Nelson, Buller, and Westland; Stewart Island.

Ecology

Grasslands, often in flushed sites, at sea level to 1300 m.

Cytology

2n = 28, HW

Reproductive biology

Chasmogamous and cleistogamous.

Top

Formal citation

Stenostachys laevis (Petrie) Connor

The link is to TROPICOS which also provides information on the basionym and synonyms.

Reference(s)

Connor, H.E. 1994. Indigenous New Zealand Triticeae: Gramineae. New Zealand Jornal of Botany 32: 125-154.