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Descriptions

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

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

Maclurochloa tonkinensis

HABIT Perennial; caespitose; clumped densely. Rhizomes short; pachymorph. Culms scandent; 2000 cm long; 30–35 mm diam.; woody; without nodal roots. Culm-internodes terete; hollow; 50–58 cm long; distally pilose (when young). Culm-nodes swollen; pubescent. Lateral branches dendroid. Branch complement several; with 1 branch dominant. Culm-sheaths 20–21 cm long; 1.4 times as long as wide; auriculate; with unequal auricles; with 3–13 mm high auricles; setose on shoulders; shoulders with 2 mm long hairs. Culm-sheath ligule 1 mm high. Culm-sheath blade triangular; erect; 6–11 cm long. Leaf-sheaths pilose. Leaf-sheath oral hairs setose; 4–5 mm long. Leaf-sheath auricles erect; 2–3 mm long. Ligule an eciliate membrane. Collar with external ligule. Leaf-blade base broadly rounded; with a brief petiole-like connection to sheath; petiole 0.4–0.5 cm long. Leaf-blades lanceolate, or oblong; 26–28 cm long; 34–39 mm wide; dark green and light green; discolorous with last colour beneath. Leaf-blade venation with 18 secondary veins. Leaf-blade apex acute.

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

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 15 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet. Upper glume ovate; 8–9 mm long; 18–20 -veined. Upper glume primary vein conspicuous. Upper glume surface pilose (sparsely).

FLORETS Fertile lemma ovate; 11–12 mm long; 6–7 mm wide; without keel; 19–21 -veined. Lemma surface pubescent. Lemma apex acute. Palea 11–12 mm long; 2-keeled. Palea surface pilose. Apical sterile florets 1 in number.

FLOWER Lodicules 3; 2.5–3.2 mm long; ciliate. Stigmas 3; plumose. Ovary pubescent on apex.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Nguyen & Tran 2014.

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