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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 lunata

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 25–35 cm long. Leaf-sheaths 3–5 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 2–5 mm long; acute. Leaf-blades conduplicate, or involute; 8–15 cm long; 1–2 mm wide. Leaf-blade midrib conspicuous. Leaf-blade venation with 7–9 secondary veins. Leaf-blade surface scabrous; rough adaxially; glabrous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle open; lanceolate; 5–9 cm long; 1–1.5 cm wide. Primary panicle branches appressed, or ascending; 1–2 -nate; 3–5.3 cm long; bearing 3–25 fertile spikelets on each lower branch. Panicle axis scabrous. Panicle branches flexuous; angular; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1–3 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 4–7.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.25–4 mm long; 1 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or distinct. Lower glume surface scabrous; rough on veins. Lower glume margins eciliate, or ciliolate. Lower glume apex acute. Upper glume lanceolate; 2.25–4 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface scabrous; rough on veins. Upper glume margins eciliate, or ciliolate. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; elliptic in profile; 3.5–5 mm long; membranous; keeled; 3–5 -veined. Lemma midvein scabrous. Lemma surface glabrous. Lemma apex acute. Palea lanceolate; 3.5–4.1 mm long. Palea keels ciliolate; adorned above. Rhachilla extension 2–4 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 0.6–1.4 mm long.

FRUIT Caryopsis with adherent pericarp. 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.