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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 gammieana

HABIT Perennial; caespitose. Butt sheaths herbaceous. Culms 30–60 cm long; 6 -noded. Culm-internodes terete; smooth. Culm-nodes glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths loose; keeled; scaberulous, or antrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 4 mm long; obtuse. Leaf-blades 5–10 cm long; 3–7 mm wide. Leaf-blade surface smooth, or scaberulous; rough abaxially. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; elliptic; 5–10 cm long; 3–6 cm wide. Primary panicle branches spreading; 2–3 -nate. Panicle branches smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; smooth; pubescent. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear; 4 mm long; 0.9 length of upper glume; membranous; glandular; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume oblong; 4.5 mm long; 1 length of adjacent fertile lemma; membranous; glandular; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma oblong; elliptic in profile; 4.5–5 mm long; membranous; glandular on surface; keeled; 5 -veined. Lemma midvein scaberulous; ciliate; hairy below. Lemma lateral veins prominent. Lemma surface asperulous; rough below; pubescent; hairy on veins. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels ciliate; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 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.