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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Poa subvestita

HABIT Perennial; caespitose. Basal innovations extravaginal. Culms robust; 20–40 cm long. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 1–2.5 mm long; entire, or erose; acute. Leaf-blades 5–20 cm long; 2–4 mm wide; coriaceous. Leaf-blade surface scaberulous; rough adaxially; glabrous. Leaf-blade margins cartilaginous; smooth. Leaf-blade apex obtuse, or abruptly acute.

INFLORESCENCE Dioecious. Inflorescence a panicle. Peduncle smooth.

Panicle open; nodding; 6–10 cm long. Panicle branches smooth, or with occasional prickles.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 8–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; glabrous, or sparsely hairy. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–4.5 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 3–5.5 mm long; 0.66–0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein smooth. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma lanceolate; 4.5–6 mm long; membranous; much thinner on margins; keeled; 3 -veined. Lemma surface smooth; pubescent; hairy below; hairy on veins. Lemma apex obtuse, or acute. Palea 3.5–4 mm long. Palea keels ciliolate; adorned above.

FLOWER Lodicules 2; 0.5–1 mm long; membranous. Anthers 3; 2–3 mm long. Staminodes present; 0.3–0.7 mm long.

FRUIT Caryopsis with adherent pericarp; 0.5–0.8 mm long. Hilum punctiform.

MALE Male inflorescence similar to female. Male spikelets resembling female.

DISTRIBUTION Australasia: New Zealand.

NOTES Poeae. Edgar 1995.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.