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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 matsumurae

HABIT Perennial; caespitose; clumped loosely. Stolons present. Culms erect; 35–75 cm long; 1–1.25 mm diam.; 2–3 -noded. Culm-internodes terete. Leaves mostly basal. Leaf-sheaths open for most of their length; without keel; smooth; glabrous on surface, or pubescent. Ligule an eciliate membrane; 1–2 mm long; white; truncate, or obtuse. Leaf-blades 12–25 cm long; 1.2–3.5 mm wide. Leaf-blade surface glabrous to pubescent; hairy adaxially. Leaf-blade apex attenuate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic, or ovate; 6–15 cm long; 3–5 cm wide. Primary panicle branches 3–5 -nate; 1.7–6 cm long. Panicle branches capillary; scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate; laterally compressed; 4.5–6.2 mm long; 2.5–3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly. Floret callus hairs 0.6 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5–3 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.8–3.5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile lemma elliptic; elliptic in profile; 3.2–4 mm long; membranous; much thinner on margins; keeled; 5 -veined. Lemma midvein pubescent; hairy below. Lemma lateral veins with distinct primaries but obscure intermediates. Lemma surface pubescent; hairy below; hairy on veins. Lemma apex acute. Palea keels scabrous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.7–2 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Poeae. Koyama 1994.

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