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Descriptions

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

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

Leymus mendocinus

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms 45–90 cm long; 3 -noded. Culm-internodes distally glabrous. Culm-nodes black; glabrous. Leaf-sheaths smooth; glabrous on surface. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.5 mm long. Leaf-blades 4–25 cm long; 3–6 mm wide; stiff; glaucous. Leaf-blade surface scabrous; rough adaxially. Leaf-blade margins scabrous. Leaf-blade apex attenuate; pungent.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 12–16 cm long; bearing 10–18 fertile spikelets on each. Rhachis ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear; 10–20 mm long. Rhachis internode tip flat.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 5–6 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2.5–3 mm long; pilose.

GLUMES Glumes collateral; persistent; similar; shorter than spikelet. Lower glume linear; 5–7 mm long; 0.66 length of upper glume; coriaceous; without keels; 1(–3) -veined. Lower glume lateral veins absent, or obscure. Lower glume apex acuminate; muticous. Upper glume lanceolate; 8–10 mm long; coriaceous; without keels; 3 -veined. Upper glume apex acuminate; muticous.

FLORETS Fertile lemma lanceolate; 12–14 mm long; coriaceous; 5–7 -veined. Lemma surface pubescent. Lemma margins ciliolate. Lemma apex acuminate to setaceously attenuate. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 5–6 mm long. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; fusiform; sulcate on hilar side; 7 mm long; hairy at apex. Hilum linear; 1 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Triticeae. Parodi 1997.

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