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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 rectisetus

HABIT Perennial. Basal innovations extravaginal and intravaginal. Culms geniculately ascending, or decumbent; 100–150 cm long. Culm-internodes smooth, or scaberulous; distally pubescent. Leaf-sheaths 5–10 cm long; hirsute; with simple hairs, or reflexed hairs. Leaf-sheath auricles falcate; 0.5–1 mm long. Ligule an eciliate membrane; 0.1 mm long; truncate. Leaf-blades 18 cm long; 1–4 mm wide. Leaf-blade surface smooth, or scaberulous; hirsute; hairy on both sides.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; drooping; bilateral; 10–20 cm long; bearing 5–10 fertile spikelets on each. Rhachis flattened; scabrous on surface. Spikelet packing broadside to rhachis. Rhachis internodes linear. Rhachis internode tip flat.

Spikelets appressed; solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–10 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 40–55 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5–2.3 mm long; pilose. Floret callus 0.75 mm long; pilose.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4–10 mm long; 1 length of upper glume; coriaceous; 1-keeled; 3–5 -veined. Lower glume surface pilose; hairy at apex. Lower glume apex setaceously attenuate. Upper glume lanceolate; 4–10 mm long; coriaceous; 1-keeled; 3–5 -veined. Upper glume surface pilose; hairy at apex. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma lanceolate; 9–11 mm long; coriaceous; keeled; keeled above. Lemma apex awned; 1 -awned. Principal lemma awn straight; 30–50 mm long overall. Palea 9–11 mm long. Palea apex emarginate, or truncate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; 1–1.25 mm long; membranous. Anthers 3; 1.8–2.3 mm long. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 6–6.5 mm long. Embryo 0.15 length of caryopsis.

DISTRIBUTION Australasia: Australia and New Zealand.

NOTES Triticeae. Connor 2000.

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