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Descriptions

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

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

Glyceria colombiana

HABIT Perennial; caespitose. Culms geniculately ascending; 20–40 cm long; rooting from lower nodes. Culm-nodes brown; glabrous. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 2 mm long; lacerate. Collar glabrous. Leaf-blades flat, or conduplicate; 10–23 cm long; 3–5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scaberulous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle. Peduncle 10–15 cm long.

Panicle open; pyramidal; 10–15 cm long. Primary panicle branches drooping; 2.5–10 cm long. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1–6 mm long; glabrous.

FERTILE SPIKELETS Spikelets comprising 5–7 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4–6 mm long; 2–3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 1.4–1.5 mm long; 0.9 length of upper glume; membranous; purple; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface glabrous. Lower glume apex erose. Upper glume ovate; 1.6–1.7 mm long; 0.75 length of adjacent fertile lemma; membranous; purple; without keels; 1 -veined. Upper glume lateral veins absent. Upper glume apex erose.

FLORETS Fertile lemma oblong; 2.3–2.5 mm long; membranous; much thinner above; without keel; 7 -veined. Lemma lateral veins prominent. Lemma surface scaberulous; rough on veins. Lemma apex erose; acute. Palea 2–2.5 mm long; 1 length of lemma; 2 -veined. Palea keels scaberulous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; united; oblong; 0.2 mm long; fleshy; truncate. Anthers 2; 0.5 mm long; yellow.

FRUIT Caryopsis with adherent pericarp; ovoid; laterally compressed; 1.25 mm long; rugose. Hilum linear; 1 length of caryopsis.

DISTRIBUTION South America: western South America.

NOTES Meliceae. Giraldo-Canas.

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