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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 hirtiglumis

HABIT Perennial; caespitose. Butt sheaths herbaceous; persistent and investing base of culm. Culms erect, or geniculately ascending; 16–25 cm long. Culm-internodes terete; smooth. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths tight; smooth; glabrous on surface. Ligule an eciliate membrane; 3–4 mm long; obtuse. Leaf-blades 5–7.5 cm long; 3–4 mm wide. Leaf-blade margins scabrous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; pyramidal; 5–9 cm long. Primary panicle branches drooping; 3 -nate. Panicle branches flexuous; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets elliptic, or obovate, or cuneate; laterally compressed; 4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous, or pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5–3 mm long; 0.9 length of upper glume; membranous; much thinner on margins; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume ovate; 2.75–3.25 mm long; 1.3–1.4 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma oblong; elliptic in profile; 2–2.5 mm long; membranous; much thinner above; keeled; 5 -veined. Lemma midvein ciliate; hairy all along. Lemma surface pubescent; hairy all along; hairy on back. Lemma hairs yellow. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels ciliate; adorned in the middle, or below. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 0.75–1 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

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

NOTES Poeae. Bor.

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