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Descriptions

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

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

Leymus komarovii

HABIT Perennial; culms solitary. Rhizomes short. Culms erect; 30–130 cm long; 4–6 -noded. Culm-internodes distally glabrous. Leaf-sheaths glabrous on surface, or puberulous. Ligule an eciliate membrane; 1.5 mm long; truncate. Leaf-blades linear, or lanceolate; 10–20 cm long; 10–25 mm wide; dark green. Leaf-blade surface scaberulous; rough abaxially; pilose; sparsely hairy; hairy adaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence composed of racemes. Peduncle pubescent above.

Racemes 1; single; arcuate; bilateral; 10–20 cm long; 10–15 mm wide. Rhachis pubescent on surface; ciliate on margins. Spikelet packing broadside to rhachis; lax; with lowest internode elongated. Rhachis internodes linear; 3–7 mm long.

Spikelets in pairs. Fertile spikelets sessile; 2 in the cluster.

FERTILE SPIKELETS Spikelets comprising 2–3 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; dorsally compressed; 9–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1–2 mm long; sparsely hairy. Floret callus pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume subulate; 3–8 mm long; 1 length of upper glume; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous; puberulous. Upper glume subulate; 3–8 mm long; 1 -veined. Upper glume lateral veins absent. Upper glume surface puberulous.

FLORETS Fertile lemma lanceolate; 9–12 mm long; coriaceous; without keel; 5–7 -veined. Lemma surface hispidulous. Lemma apex attenuate; awned; 1 -awned. Principal lemma awn 10–15 mm long overall; 1 length of lemma; limb scabrous. Palea 8–9 mm long; 0.75–0.9 length of lemma. Palea keels ciliolate. Palea apex dentate; 2 -fid.

FLOWER Lodicules 2. Anthers 3; 2–3 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; linear; sulcate on hilar side; hairy at apex.

DISTRIBUTION Asia-temperate: Soviet far east and China.

NOTES Triticeae. Koyama 1994.

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