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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 patagonicus

HABIT Perennial; caespitose. Basal innovations extravaginal, or intravaginal. Culms erect, or geniculately ascending; 60–150 cm long; 4–6 -noded. Leaf-sheaths glabrous on surface, or puberulous. Ligule an eciliate membrane; 1.1–1.5 mm long; truncate. Leaf-blades flat (rarely), or conduplicate, or convolute; 15–35 cm long; 3–7 mm wide. Leaf-blade surface pubescent; hairy adaxially, or on both sides. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence composed of racemes.

Racemes 1; single; bilateral; 6–11 cm long. Rhachis fragile at the nodes; glabrous on margins. Spikelet packing broadside to rhachis. Rhachis internodes linear; 3–4.5 mm long; falling with spikelet above. Rhachis internode tip flat.

Spikelets in pairs, or in threes. Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets; with diminished florets at the apex. Spikelets elliptic to oblong; laterally compressed; 6–7 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear; 4–6 mm long; 1 length of upper glume; coriaceous; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute; awned; 1 -awned. Lower glume awn 2–3 mm long. Upper glume linear; 4–6 mm long; 0.66 length of adjacent fertile lemma; coriaceous; without keels; 2–3 -veined. Upper glume apex acute; awned; 1 -awned. Upper glume awn 2–3 mm long.

FLORETS Fertile lemma lanceolate; 7–9 mm long; coriaceous; 5 -veined. Lemma apex emarginate; awned; 1 -awned. Principal lemma awn 2–3(–5) mm long overall. Palea 0.9 length of lemma. Palea keels ciliolate. Apical sterile florets rudimentary.

FLOWER Lodicules 2; membranous. Anthers 3; 2.5–3 mm long. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 4–4.5 mm long; dark brown.

DISTRIBUTION South America: southern South America.

NOTES Triticeae. Fl Pat 2000.

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