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Descriptions

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

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

Cephalostachyum langbianense

HABIT Perennial. Rhizomes short; pachymorph. Culms scandent; woody. Culm-internodes terete; hollow; 10–20 cm long; distally pubescent. Lateral branches dendroid. Culm-sheaths deciduous. Culm-sheath blade lanceolate; erect; 8–10 cm long. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 20–40 cm long; 40–65 mm wide; stiff; glandular. Leaf-blade venation with 24–26 secondary veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; 3–4 cm long; dense; 2–10 cm between clusters; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 18–20 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 3–4 empty glumes; persistent; shorter than spikelet. Lower glume ovate; 3–4 mm long. Lower glume surface pubescent. Upper glume ovate; 10 mm long; chartaceous; without keels. Upper glume surface pubescent.

FLORETS Fertile lemma ovate; 12–15 mm long; chartaceous; without keel. Lemma margins convolute; ciliate. Lemma apex acuminate; mucronate. Palea lanceolate, or ovate; 8–10 mm long; chartaceous; 2-keeled but the uppermost without keels. Palea keels approximate; ciliate. Palea apex dentate; 2 -fid. Rhachilla extension 7–8 mm long. Apical sterile florets 1 in number; barren; lanceolate.

FLOWER Lodicules 3; veined; ciliate. Anthers 6; 5 mm long; anther tip with extended connective and pubescent. Filaments free. Stigmas 3. Ovary with a steeple-like appendage; glabrous.

FRUIT Caryopsis with free brittle pericarp.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Lecomte 1996.

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