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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Puccinellia sibirica

HABIT Perennial; caespitose; clumped densely. Cataphylls inconspicuous. Culms erect, or geniculately ascending; 25–50 cm long. Leaf-sheaths open for most of their length. Ligule an eciliate membrane; 2–3 mm long; entire, or lacerate; acute. Leaf-blades 3–6 cm long; 1.5–2.5 mm wide; light green. Leaf-blade venation without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface scaberulous; rough adaxially; glabrous. Leaf-blade margins scaberulous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate, or pyramidal; loose; 8–15 cm long. Primary panicle branches spreading; bearing 5–20 fertile spikelets on each lower branch. Panicle branches flexuous; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; compressed slightly; 4–6 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; shorter than spikelet. Lower glume lanceolate; 1–1.2 mm long; 0.5–0.66 length of upper glume; membranous; purple; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex emarginate, or obtuse. Upper glume oblong; 1.5–2 mm long; 0.5–0.66 length of adjacent fertile lemma; membranous; purple; without keels; 3 -veined. Upper glume margins ciliolate. Upper glume apex emarginate.

FLORETS Fertile lemma ovate; 2.7–3 mm long; cartilaginous; much thinner above; light green and purple; suffused with last colour; shiny; without keel; 5 -veined. Lemma lateral veins prominent; stopping well short of apex. Lemma surface hirsute; hairy below; hairy on veins. Lemma margins ciliate. Lemma apex obtuse. Palea 1 length of lemma; 2 -veined. Palea keels scabrous; ciliate; adorned with hairs below. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 0.6–0.7 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; lanceolate; 1.5 mm long. Hilum punctiform.

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

NOTES Poeae. Holmb 1997.

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