Poa sachalinensis

HABIT Perennial; culms solitary. Rhizomes short. Stolons present. Culms erect; 30–80 cm long; 1–1.5 mm diam.; 2–3 -noded. Culm-internodes terete. Leaf-sheaths smooth. Ligule an eciliate membrane; 1–2.5 mm long; truncate, or obtuse. Leaf-blades 20–30 cm long; 2–5 mm wide. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 7–20 cm long; 3.5–5 cm wide. Primary panicle branches 3–5 -nate; bearing 3–7 fertile spikelets on each lower branch. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 5–8 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; 2.5–4 mm long; 0.66–0.9 length of upper glume; membranous; much thinner on margins; 1-keeled; 1–3 -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acute. Upper glume lanceolate; 3.7–4.5 mm long; 0.9–1 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume lateral veins obscure; all falling short of apex. Upper glume apex acute.

FLORETS Fertile lemma oblong; elliptic in profile; 4–4.5 mm long; membranous; much thinner on margins; keeled; 5 -veined. Lemma surface puberulous; hairy on veins. Lemma apex obtuse, or acute. Palea keels scaberulous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5–2 mm long.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-temperate: Soviet far east and eastern Asia.

NOTES Poeae. Koyama 1994.

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