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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 keysseri

HABIT Perennial; caespitose. Butt sheaths dark brown. Basal innovations intravaginal. Culms erect; 25–120 cm long; 3–6 -noded. Leaf-sheaths smooth; glabrous on surface. Ligule a ciliolate membrane; 0.4–0.7 mm long; truncate. Leaf-blades erect; flat, or conduplicate; 10–14 cm long; 2–3 mm wide; stiff. Leaf-blade venation with 5–9 secondary veins. Leaf-blade surface scabrous, or papillose; rough adaxially; glabrous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle antrorsely scabrous above.

Panicle open; oblong, or ovate; 7–25 cm long. Primary panicle branches appressed, or ascending; 1–7 -nate; 3–6 cm long. Panicle branches terete, or angular; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 5–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.7–0.8 mm long; smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 1.7–5.5 mm long; 0.66–1 length of upper glume; membranous; 1-keeled; 3–5 -veined. Lower glume primary vein scabrous. Lower glume surface scabrous; rough on veins. Lower glume margins ciliolate. Lower glume apex acute. Upper glume lanceolate; 2.5–5.3 mm long; 0.9–1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface scabrous; rough on veins. Upper glume apex acute.

FLORETS Fertile lemma elliptic; elliptic in profile; 2.2–5.5 mm long; membranous; keeled; 5 -veined. Lemma surface asperulous; rough on veins; glabrous. Lemma margins ciliolate; hairy above. Lemma apex obtuse, or acute. Palea elliptic; 2–4.5 mm long. Palea keels scabrous; adorned in the middle. Rhachilla extension 1–1.75 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 0.8–2.7 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.