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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 longisetus

HABIT Perennial; caespitose; clumped loosely. Culms erect; 50–80 cm long. Culm-internodes distally glabrous. Culm-nodes black; glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Leaf-sheath auricles absent, or falcate. Ligule an eciliate membrane; 0.6–1 mm long. Leaf-blades flat, or involute; 9–33 cm long; 1–5 mm wide. Leaf-blade surface glabrous to pilose.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; arcuate; bilateral; 7–20 cm long; bearing 4–10 fertile spikelets on each. Spikelet packing broadside to rhachis. Rhachis internodes linear.

Spikelets solitary. Fertile spikelets sessile. Pedicels oblong; 1 mm long; puberulous.

FERTILE SPIKELETS Spikelets comprising 4–10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 20–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–3 mm long; pubescent. Floret callus evident; 1 mm long; pilose; with elliptic scar.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 5–15 mm long; 0.75–0.85 length of upper glume; coriaceous; without keels; 3–5 -veined. Lower glume apex acute. Upper glume lanceolate; 6–18 mm long; 0.8–1.1 length of adjacent fertile lemma; coriaceous; without keels; 6–7 -veined. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 11–16 mm long; coriaceous; without keel; 5–7 -veined. Lemma lateral veins convergent above. Lemma surface puberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 32–42 mm long overall. Palea 1 length of lemma. Palea keels scabrous. Palea surface puberulous; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.5–2 mm long; retained within floret. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 7.5 mm long.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Triticeae. Veldkamp 1993.

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