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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 apricus

HABIT Perennial; caespitose. Rhizomes absent, or elongated. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Basal innovations intravaginal. Culms erect; 50–100 cm long. Culm-nodes black. Leaf-sheaths 7–10 cm long; keeled; striately veined; glabrous on surface, or pubescent. Leaf-sheath oral hairs lacking, or ciliate. Leaf-sheath auricles absent, or falcate; 0.3–0.5 mm long. Ligule a ciliolate membrane; 0.3–0.5 mm long. Collar ciliate. Leaf-blades 20–30 cm long; 2–4 mm wide; glaucous. Leaf-blade surface ribbed; glabrous, or pilose. Leaf-blade margins scabrous.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 18–25 cm long; bearing 3–7 fertile spikelets on each. Rhachis flattened; scabrous on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear. Rhachis internode tip flat.

Spikelets spreading, or deflexed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 6–12 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 30–50 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–3 mm long; pubescent. Floret callus 0.75 mm long; pilose.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 5–10 mm long; 1 length of upper glume; coriaceous; without keels; 3 -veined. Lower glume margins ciliate. Lower glume apex acuminate to setaceously attenuate. Upper glume lanceolate; 5–10 mm long; coriaceous; without keels; 3 -veined. Upper glume margins ciliate. Upper glume apex acuminate to setaceously attenuate.

FLORETS Fertile lemma lanceolate; 10–14 mm long; coriaceous; keeled; keeled above. Lemma surface scaberulous; rough above. Lemma margins scaberulous. Lemma apex entire, or dentate; 2 -fid; awned; 1 -awned. Principal lemma awn apical, or from a sinus; straight, or curved; 22–45 mm long overall. Palea 6–13 mm long. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 1–2.5 mm long; membranous. Anthers 3; 4–9 mm long; yellow, or purple. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 7–10 mm long. Embryo 0.2 length of caryopsis.

DISTRIBUTION Australasia: New Zealand.

NOTES Triticeae. Connor 2000.

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