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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 callosa

HABIT Perennial; caespitose. Culms 4–12 cm long; 1–2 -noded. Leaves distichous. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 0.5–1 mm long; acute. Leaf-blades deciduous at the ligule; conduplicate, or involute; 1.5–4.8 cm long; 1–2 mm wide; coriaceous; stiff. Leaf-blade venation with 5–7 secondary veins. Leaf-blade surface glabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.

Panicle contracted; lanceolate; 1.2–1.8 cm long. Primary panicle branches appressed; 2.2–2.7 cm long; bearing 1–4 fertile spikelets on each lower branch. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; 4.5–6.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–1.75 mm long; smooth. Floret callus sparsely hairy.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 2–3.1 mm long; 0.66–0.9 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or distinct; meeting at apex. Lower glume apex acute. Upper glume lanceolate; 3–3.2 mm long; 0.8 length of adjacent fertile lemma; membranous; 1-keeled; 3–5 -veined. Upper glume primary vein scabrous; ciliate. Upper glume lateral veins meeting at apex. Upper glume apex acute.

FLORETS Fertile lemma elliptic; elliptic in profile; 3.2–3.7 mm long; membranous; keeled; 5 -veined. Lemma surface scabrous; rough above and on veins. Lemma apex acute. Palea 2.6–2.9 mm long. Palea keels ciliolate; adorned above. Palea surface pilose; hairy on back and on flanks. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 0.6–0.7 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.