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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 hypsinephes

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 2–12 cm long. Leaves distichous. Leaf-sheaths 2–5 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 0.8–2 mm long; scaberulous on abaxial surface; truncate. Leaf-blades erect; deciduous at the ligule; conduplicate; 2.2–4.5 cm long; 0.75–1.5 mm wide. Leaf-blade surface glabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle; comprising 5–38 fertile spikelets. Peduncle 0.8–3.5 cm long.

Panicle contracted; linear, or lanceolate; 2.1–4.1 cm long; 0.3–0.8 cm wide; bearing few spikelets. Primary panicle branches appressed; 1–2 -nate; 1.4–2.9 cm long; bearing 1–8 fertile spikelets on each lower branch. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 2.35–3.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.3–0.7 mm long; smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 1.2–1.6 mm long; 0.75 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 acute. Upper glume lanceolate; 1.5–2 mm long; 0.9 length of adjacent fertile lemma; membranous; with scarious margins; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma ovate; ovate in profile; 1.7–2.25 mm long; membranous; keeled; 3 -veined. Lemma midvein scabrous. Lemma apex acute. Palea keels ciliolate; adorned above. Rhachilla extension 0.6–1.5 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 0.5–0.75 mm long; purple.

FRUIT Caryopsis with adherent pericarp; oblong; 1.25 mm long. Hilum punctiform.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Poeae. Alp Fl N Guin 1994.

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