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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 polyneura

HABIT Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms geniculately ascending; 15–30 cm long. Culm-nodes glabrous. Leaf-sheaths striately veined; smooth; glabrous on surface. Ligule an eciliate membrane; 2 mm long; truncate. Leaf-blades 2–5 cm long; 2–5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex abruptly acute; hooded.

INFLORESCENCE Inflorescence a panicle.

Panicle open, or contracted; linear, or elliptic; 8–15 cm long. Primary panicle branches 2 -nate. Panicle branches smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 5.5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume elliptic; 4.5–5 mm long; 0.9–1 length of upper glume; membranous; much thinner on margins; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume lanceolate; 5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3–5 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma elliptic; elliptic in profile; 5 mm long; membranous; much thinner above; much thinner on margins; keeled; 5–7 -veined. Lemma midvein ciliate; hairy below. Lemma lateral veins with distinct primaries but obscure intermediates. Lemma surface pubescent; hairy below; hairy on back, or on veins. Lemma apex acute. Palea 1 length of lemma. Palea keels scabrous; woolly; adorned in the middle. Palea surface pilose; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2.5 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: China. Asia-tropical: India.

NOTES Poeae. Bor 1994.

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