GrassBase - The Online World Grass Flora


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

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

Elymus tilcarensis

HABIT Perennial; caespitose. Butt sheaths purple. Basal innovations intravaginal. Culms erect, or geniculately ascending; 40–80 cm long; 2–4 -noded. Culm-nodes glabrous. Leaf-sheaths striately veined; smooth; glabrous on surface. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 0.5 mm long; truncate. Leaf-blades 10–15 cm long; 2–5.5 mm wide. Leaf-blade surface ribbed; grooved adaxially; scabrous; rough adaxially, or on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 6–16 cm long; bearing 7–25 fertile spikelets on each. Rhachis ciliate on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear; 4–27 mm long. Rhachis internode tip flat.

Spikelets solitary. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 12–18 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.4–2.2 mm long.

GLUMES Glumes collateral; persistent; similar; reaching apex of florets. Lower glume lanceolate; 10–15.5 mm long; 1 length of upper glume; coriaceous; without keels; 5–7 -veined. Lower glume lateral veins prominent. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 0.9–2.3 mm long. Upper glume lanceolate; 10–15.5 mm long; coriaceous; without keels; 5–7 -veined. Upper glume lateral veins prominent. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 0.9–2.3 mm long.

FLORETS Fertile lemma lanceolate; 11–16.5 mm long; coriaceous; 5–7 -veined. Lemma surface scabrous; rough above. Lemma apex attenuate; awned; 1 -awned. Principal lemma awn 1.5–3 mm long overall. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; membranous. Anthers 3; 1.8–2.4 mm long. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; lanceolate; sulcate on hilar side; 5–6 mm long; hairy at apex.

DISTRIBUTION South America: southern South America.

NOTES Triticeae. Hunziker 1997.

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