GrassBase - The Online World Grass Flora


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

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

Poa cooperi

HABIT Perennial; caespitose. Culms 7–13 cm long. Culm-internodes smooth. Leaf-sheaths smooth. Ligule an eciliate membrane; 1.5–2.2 mm long; erose; truncate. Leaf-blades involute; 4.5–6.9 cm long; 2.2 mm wide. Leaf-blade surface glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; pyramidal; 8–16 cm long. Primary panicle branches ascending; 1 -nate; 7.7 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising (3–)4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4.5–5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.4–2.5 mm long; 0.66–0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume oblong; 3.1–3.4 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma ovate; lanceolate in profile, or oblong in profile; 3.6–3.8 mm long; 1.8 mm wide; membranous; keeled; 5 -veined. Lemma midvein ciliate; hairy below. Lemma lateral veins stopping well short of apex. Lemma surface scabrous; rough above and between veins; puberulous; hairy below; hairy between veins. Lemma margins pubescent; hairy at base. Lemma apex acute. Palea 3.5 mm long. Palea keels scaberulous. Palea surface puberulous; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; elliptic; membranous. Anthers 3; 0.9 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: India.

NOTES Poeae. Fl Bhutan 2001.

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