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Descriptions

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

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

Olmeca reflexa

HABIT Perennial; culms solitary. Rhizomes elongated; pachymorph. Culms geniculately ascending; 600–1200 cm long; 20 mm diam.; woody. Culm-internodes terete; solid. Culm-nodes flush with internodes. Lateral branches dendroid. Bud complement 1. Branch complement one; solitary. Culm-sheaths persistent; green, or brown; hispid; with dark brown hairs; setose on shoulders; shoulders with 20–30 mm long hairs. Culm-sheath ligule 1–2 mm high; ciliolate. Culm-sheath blade linear; spreading, or reflexed; 10–17 cm long; pubescent. Leaves cauline; 6–8 per branch. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs setose; erect; 20 mm long. Ligule a ciliolate membrane; 3–4 mm long; brown. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1–0.2 cm long. Leaf-blades lanceolate, or oblong; 10–12 cm long; 20–25 mm wide. Leaf-blade surface pilose; sparsely hairy; hairy abaxially. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle.

Panicle open; lanceolate; 24 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 10–20 mm long.

FERTILE SPIKELETS Spikelets comprising 6–12 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 30–40 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas; pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4–5 mm long; 0.8–0.9 length of upper glume; chartaceous; 1-keeled; 1 -veined. Lower glume apex acute. Upper glume lanceolate; 5–6 mm long; 0.75 length of adjacent fertile lemma; chartaceous; 1-keeled; 5 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 7–8 mm long; chartaceous; without keel; 7–8 -veined. Lemma apex acute. Palea linear; 6–7 mm long; 0.9 length of lemma; chartaceous; 2 -veined. Palea surface pubescent; hairy on back. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; oblong; 1.2–1.4 mm long; membranous; veinless; ciliate. Anthers 3; 1.3 mm long. Stigmas 2–3.

FRUIT Caryopsis with fleshy pericarp; orbicular; isodiametric; 17 mm long. Endosperm evanescent.

DISTRIBUTION North America: Mexico.

NOTES Bambuseae. Soderstrom.

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