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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 nephelophila

HABIT Annual. Butt sheaths herbaceous; persistent and investing base of culm; with compacted dead sheaths. Culms erect, or geniculately ascending; 20–45 cm long; 1.5–3 mm diam. Culm-internodes terete; smooth. Culm-nodes glabrous. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths loose; smooth; glabrous on surface. Ligule an eciliate membrane; 1–1.5 mm long; erose. Leaf-blades 8–16 cm long; 2–5 mm wide; flaccid. Leaf-blade surface scaberulous; rough adaxially. Leaf-blade margins cartilaginous; scabrous; glabrous, or ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle smooth.

Panicle open; pyramidal; 6–12 cm long. Primary panicle branches 4 -nate; whorled at most nodes; 1–3.5 cm long. Panicle branches smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.75–1 mm long; smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 2–2.5 mm long; 0.8 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 2.5–3 mm long; 0.7–0.8 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile lemma oblong; oblong in profile; 3.5 mm long; membranous; keeled; 5 -veined. Lemma midvein scabrous; ciliate; hairy below. Lemma margins ciliate. Lemma apex obtuse. Palea 0.9 length of lemma. Palea keels ciliolate; adorned all along. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 0.6–0.75 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Poeae. Bor.

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