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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 formosanus

HABIT Perennial; caespitose; clumped loosely. Butt sheaths glabrous, or pubescent. Culms erect; 30–80 cm long; 1–1.7 mm diam.; 3–4 -noded. Leaves basal and cauline. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades 6–20 cm long; 3–6 mm wide. Leaf-blade surface smooth, or scaberulous; glabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 7–18 cm long; 5 mm wide. Rhachis flattened. Spikelet packing broadside to rhachis. Rhachis internodes linear; 7–15 mm long. Rhachis internode tip flat.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 4–8 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 15–20 mm long; 4–5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.4–1.6 mm long; scaberulous; sparsely hairy. Floret callus pilose. Floret callus hairs 2–3 mm long; 0.25 length of lemma.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 5–7 mm long; 0.75 length of upper glume; coriaceous; much thinner on margins; without keels; 5–7 -veined. Lower glume surface scabrous; rough on veins. Lower glume apex acute. Upper glume lanceolate; 7–9 mm long; coriaceous; with membranous margins; without keels; 5–7 -veined. Upper glume surface scabrous; rough on veins. Upper glume apex acute.

FLORETS Fertile lemma oblong; 8–11 mm long; coriaceous; 5 -veined. Lemma lateral veins ribbed. Lemma surface scaberulous; glabrous, or puberulous. Lemma margins ciliate. Lemma apex acute; awned; 1 -awned. Principal lemma awn curved; 20–35 mm long overall. Palea 1 length of lemma. Palea keels winged; narrowly winged; ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3. Stigmas 2.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: eastern Asia.

NOTES Triticeae. Koyama 1994.

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