Poa hayachinensis

HABIT Perennial; culms solitary. Rhizomes absent, or elongated. Stolons absent, or present. Culms geniculately ascending; 30–60 cm long; 1–1.7 mm diam.; 2–3 -noded. Leaf-sheaths tubular for much of their length; with 0.5 of their length closed; smooth. Ligule an eciliate membrane; 0.5–1 mm long; acute. Leaf-blades 7–18 cm long; 4–6 mm wide. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; nodding; 8–15 cm long; 3–6 cm wide. Primary panicle branches spreading; 2–3 -nate; 3–6 cm long. Panicle branches smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 7–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3.8–4 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5–5.2 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; elliptic in profile; 5–5.2 mm long; membranous; keeled; 5 -veined. Lemma midvein pubescent; hairy below. Lemma surface asperulous; pubescent; hairy at base. Lemma apex acute. Palea keels scaberulous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 2.5–3 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.