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Descriptions

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

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

Aulonemia rubraligulata

HABIT Perennial. Culms rambling, or scandent; 800 cm long; 3 mm diam.; woody. Culm-internodes terete. Lateral branches dendroid. Bud complement 1. Branch complement one; solitary. Leaf-sheaths striately veined; glabrous on surface; outer margin hairy. Leaf-sheath oral hairs scanty. Leaf-sheath auricles absent. Ligule an eciliate membrane; 20–45 mm long; acute. Collar with external ligule. Leaf-blade base symmetrical; with a brief petiole-like connection to sheath; petiole 0.2–0.3 cm long. Leaf-blades linear, or lanceolate; 15–25 cm long; 7–23 mm wide. Leaf-blade venation without cross veins. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acute.

INFLORESCENCE Inflorescence a panicle. Peduncle 4–8 cm long.

Panicle open; ovate; effuse; 8–20 cm long. Primary panicle branches ascending. Panicle branches capillary; smooth.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–7 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; (12–)17–35 mm long; 2 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2.7–3.3 mm long; eventually visible between lemmas; glabrous. Floret callus pubescent. Floret callus hairs 0.3–0.4 mm long.

GLUMES Glumes two; persistent; shorter than spikelet; thinner than fertile lemma. Lower glume linear, or lanceolate; 1–1.5 mm long; membranous; 1 -veined. Lower glume lateral veins absent. Lower glume surface glabrous. Lower glume apex acute. Upper glume lanceolate; 2.5–3 mm long; membranous; 1–3 -veined. Upper glume primary vein absent, or obscure. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 4.6–5.3 mm long; chartaceous; without keel; 5–7 -veined. Lemma surface glabrous. Lemma apex acute. Palea 0.9 length of lemma. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; veined; ciliate. Anthers 3. Stigmas 2.

DISTRIBUTION South America: western South America.

NOTES Bambuseae. Judz. & Geisthardt 2014.

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