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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 burmanicum

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 1500–1800 cm long; 80–100 mm diam.; woody. Culm-internodes terete; hollow; 50 cm long; glaucous; distally hispid. Lateral branches dendroid. Culm-sheaths brown; hispid; with black hairs; auriculate; setose on shoulders; shoulders with curved hairs. Culm-sheath blade ovate; cordate; pubescent; acuminate. Leaf-sheaths striately veined; glabrous on surface. Leaf-sheath oral hairs scanty; deciduous. Leaf-sheath auricles erect. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 15–35 cm long; 25–32 mm wide. Leaf-blade midrib conspicuous. Leaf-blade venation with 14–26 secondary veins; with obscure cross veins. Leaf-blade surface scabrous; rough on both sides. Leaf-blade margins scabrous. Leaf-blade apex acuminate; antrorsely scabrous.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; dense; with glumaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with a barren rhachilla extension, or with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 12–18 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 1–2 empty glumes; persistent; shorter than spikelet. Upper glume ovate; chartaceous; without keels. Upper glume apex acuminate; mucronate.

FLORETS Fertile lemma lanceolate; 7–9 mm long; chartaceous; without keel. Lemma surface pubescent. Lemma apex acuminate; mucronate, or awned; 1 -awned. Principal lemma awn 0.5–0.9 mm long overall. Palea 1 length of lemma; chartaceous. Palea keels approximate. Palea apex dentate; 2 -fid; with excurrent keel veins. Apical sterile florets 1 in number; rudimentary.

FLOWER Lodicules 3; veined; ciliate. Anthers 6; anther tip smooth. Filaments free. Stigmas 2–3. Ovary with a steeple-like appendage; glabrous.

FRUIT Caryopsis with free brittle pericarp; oblong, or obovoid.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Parker 2002.

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