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Descriptions

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

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

Bambusa sinospinosa

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; nodding at the tip; 1500–2000 cm long; 40–80 mm diam.; woody; with root thorns from the nodes. Culm-internodes terete; hollow. Lateral branches dendroid. Buds or branches present on lower quarter of culm. Branch complement one, or two. Culm-sheaths deciduous; coriaceous; truncate at apex; auriculate; with equal auricles; setose on shoulders; shoulders with curved hairs; shoulders with 10 mm long hairs. Culm-sheath ligule 3–6 mm high; fimbriate. Culm-sheath blade narrowly ovate; demarcated but persistent; reflexed; hispid. Leaves cauline; 8 per branch. Leaf-sheaths glabrous on surface, or pubescent; outer margin hairy. Leaf-sheath oral hairs lacking, or ciliate; pale. Leaf-sheath auricles absent, or falcate. Ligule a ciliolate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole pubescent. Leaf-blades linear, or lanceolate; 6.5–14.5 cm long; 6–12 mm wide. Leaf-blade venation indistinct; with 8–10 secondary veins; without cross veins. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

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

FERTILE SPIKELETS Spikelets comprising 6–12 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 30–40 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 2–4 mm long.

GLUMES Glumes several; comprising 3–5 gemmiferous bracts; 0 empty glumes.

FLORETS Fertile lemma lanceolate, or ovate; 5–9.5 mm long; dark green; without keel. Lemma apex acute. Palea keels ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; 1.4 mm long; membranous; veined; ciliate. Anthers 6; anther tip smooth. Stigmas 3. Ovary umbonate; pubescent on apex.

DISTRIBUTION Asia-temperate: China.

NOTES Bambuseae. McClure 1996.

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