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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 hentyi

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms 2–9 cm long. Leaves distichous. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; acute. Leaf-blades deciduous at the ligule; conduplicate; 2–3 cm long; 0.5–1 mm wide. Leaf-blade surface glabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle; comprising 3–13 fertile spikelets. Peduncle smooth.

Panicle contracted; linear; 2.2–3.3 cm long; 0.3–0.4 cm wide; bearing few spikelets. Primary panicle branches appressed; 1–2 -nate; 1.2–2.3 cm long; bearing 1–5 fertile spikelets on each lower branch. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising (1–)2–3(–4) fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 2.5–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.25–0.5 mm long; smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 1.3–1.75 mm long; 0.9 length of upper glume; membranous; much thinner on margins; 1-keeled; 1–3 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent, or distinct. Lower glume apex acute. Upper glume lanceolate; 1.5–1.85 mm long; 0.75 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; 1.9–2.6 mm long; membranous; keeled; 3 -veined. Lemma midvein without distinctive roughness, or scaberulous. Lemma lateral veins obscure. Lemma apex acute. Palea keels ciliolate; adorned all along. Rhachilla extension 1.5–1.6 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 0.5–0.65 mm long; purple.

FRUIT Caryopsis with adherent pericarp; oblong; 1.2 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.