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Descriptions

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

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

Elymus pulanensis

HABIT Perennial; caespitose; clumped loosely. Culms 30–50 cm long; 3–4 -noded. Leaf-sheaths mostly shorter than adjacent culm internode; smooth. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades flat, or involute; 7–10 cm long; 1.5–3 mm wide. Leaf-blade surface smooth, or scaberulous; glabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; arcuate; bilateral; 8–10 cm long; bearing few fertile spikelets; bearing 5–8 fertile spikelets on each. Rhachis flattened; smooth on surface; glabrous on surface; smooth on margins. Spikelet packing broadside to rhachis. Rhachis internodes oblong; 14–20 mm long.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 7–9 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 22–26 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate, or oblong; 4.5–5 mm long; 0.7–0.9 length of upper glume; coriaceous; much thinner on margins; without keels; 3–5 -veined. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn (1–)1.5–5(–7) mm long. Upper glume lanceolate, or oblong; 5–7 mm long; 0.5–0.6 length of adjacent fertile lemma; coriaceous; with membranous margins; without keels; 3–5 -veined. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn (1–)1.5–5(–7) mm long.

FLORETS Fertile lemma lanceolate; 11 mm long; coriaceous; 5 -veined. Lemma surface glabrous, or hispidulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; reflexed; 30–40 mm long overall. Palea 1 length of lemma. Palea keels ciliolate; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; elliptic; membranous. Anthers 3; 5 mm long. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Triticeae. Yang 1996.

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