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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 duriuscula

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; 1000–1200 cm long; 100 mm diam.; woody; without nodal roots, or with root thorns from the nodes. Culm-internodes terete; with small lumen; distally glabrous. Lateral branches dendroid. Branch complement several; with 1 branch dominant. Culm-sheaths deciduous; glabrous, or puberulous; with appressed hairs; with tawny hairs; truncate at apex, or convex at apex; auriculate; with unequal auricles; setose on shoulders; shoulders with 8 mm long hairs. Culm-sheath ligule 3 mm high; dentate, or ciliate. Culm-sheath blade triangular; narrower than sheath; erect; pubescent; acuminate. Leaves cauline; 8 per branch. Leaf-sheaths glabrous on surface. Leaf-sheath oral hairs setose; 12 mm long. Ligule an eciliate membrane. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 4.5–18 cm long; 8–25 mm wide. Leaf-blade venation with 8–10 secondary veins. Leaf-blade surface pubescent; hairy abaxially. 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.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets linear, or lanceolate; laterally compressed; 20 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 1.5 mm long; pubescent.

GLUMES Glumes two; persistent; shorter than spikelet.

FLORETS Fertile lemma ovate; 7 mm long; without keel. Lemma surface glabrous. Lemma apex acute. Palea 1 length of lemma. Palea keels eciliate. Palea apex ciliate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; 3 mm long; membranous; veined; ciliate. Anthers 6; 4.5 mm long. Stigmas 2. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Bambuseae. Lin 2002.

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