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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 lavrenkoi
HABIT Perennial; caespitose; clumped loosely. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Basal innovations intravaginal. Culms erect; 18–30 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths tubular for much of their length; with 0.8 of their length closed. Ligule an eciliate membrane; 0.5–0.8 mm long; truncate. Leaf-blades flat, or conduplicate; 1–2 mm wide; glaucous.
INFLORESCENCE Inflorescence a panicle.
Panicle open; elliptic. Primary panicle branches 2–4 -nate. Panicle branches smooth.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; 2.5–3.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous. Floret callus pilose. Floret callus hairs 0.33–0.5 length of lemma.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 1.8–2.2 mm long; 1–1.5 length of upper glume; membranous; 1-keeled. Lower glume apex acute. Upper glume elliptic, or ovate; 1.5 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
FLORETS Fertile lemma ovate; oblong in profile; 1.8–2.2 mm long; membranous; keeled; 5 -veined. Lemma midvein pubescent; hairy below. Lemma surface pubescent; hairy below; hairy on veins. Lemma apex acute. Palea 1 length of lemma. Palea keels smooth, or scaberulous. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Anthers 3; 1–1.8 mm long.
DISTRIBUTION Europe: eastern.
NOTES Poeae. Kuczerov 2006.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.