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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 irkutica
HABIT Perennial. Stolons present. Culms geniculately ascending; 50–90 cm long. Culm-internodes smooth. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2 mm long; obtuse. Leaf-blades 4–15 cm long; 4–7 mm wide. Leaf-blade surface smooth; glabrous. Leaf-blade apex abruptly acute.
INFLORESCENCE Inflorescence a panicle.
Panicle open; pyramidal; 7–15 cm long. Panicle branches smooth.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 4 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume apex acute. Upper glume ovate; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Fertile lemma ovate; elliptic in profile; 4–4.5 mm long; membranous; keeled; 5 -veined. Lemma midvein ciliolate; hairy below. Lemma lateral veins distinct. Lemma surface pubescent; hairy on veins. Lemma margins ciliolate; hairy below. Lemma apex acute. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2; membranous. Anthers 3.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION Asia-temperate: Siberia.
NOTES Poeae. Fl USSR 1995.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.