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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 jaunsarensis

HABIT Perennial. Rhizomes elongated. Butt sheaths scarious; persistent and investing base of culm; with compacted dead sheaths. Culms erect; 40–80 cm long. Culm-internodes terete; smooth. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths loose; longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 2.5–4.5 mm long; acute. Leaf-blades conduplicate; 10–20 cm long; 3–4 mm wide; stiff. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf. Peduncle smooth.

Panicle open; elliptic; 10 cm long; 3–4 cm wide. Primary panicle branches 2 -nate. Panicle branches terete; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 2.75–3.5 mm long; 0.75–0.8 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume oblong; 3.5–3.75 mm long; 1 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; 3.5–4.5 mm long; membranous; keeled; 5 -veined. Lemma midvein ciliate; hairy all along. Lemma lateral veins prominent. Lemma surface pubescent; hairy on veins. Lemma margins ciliate. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels scabrous; 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-tropical: India.

NOTES Poeae. Bor.

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