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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 ullungdoensis

HABIT Perennial; caespitose. Butt sheaths purple. Culms geniculately ascending; 25–40 cm long; 5–8 -noded. Culm-internodes elliptical in section. Lateral branches lacking. Leaf-sheaths tubular for much of their length; longer than adjacent culm internode; smooth; glabrous on surface. Ligule an eciliate membrane; 0.2 mm long; truncate. Leaf-blades involute; 9–17 cm long; 1–2 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; lanceolate; 5–10 cm long; 1–1.7 cm wide. Primary panicle branches appressed; 2–5 -nate; simple, or sparsely divided; 2.2–2.8 cm long. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 2–4 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 2.5–5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 1.2–2.2 mm long; 0.8–1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 1.7–2.8 mm long; 0.66–0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 3 mm long; membranous; keeled; 5 -veined. Lemma midvein pubescent; hairy below. Lemma lateral veins obscure, or distinct. Lemma margins pilose; hairy at base. Lemma apex acute. Palea keels scabrous. Palea apex entire, or dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 0.2–0.3 mm long; membranous. Anthers 3; 1.2–2 mm long; yellow.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Poeae. Man Korean Gr 1997.

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