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Descriptions

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

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

Melocalamus truongsonensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms scandent; curved; drooping at the tip; 1500–2000 cm long; 20–30 mm diam.; woody. Culm-internodes terete; solid; 58–60 cm long. Culm-nodes swollen. Lateral branches dendroid. Branch complement many; with 1 branch dominant. Culm-sheaths 16–17 cm long; 1.3 times as long as wide; pilose; with appressed hairs; with black hairs. Culm-sheath blade ovate; spreading; 4–7 cm long; 8 mm wide. Leaves 5 per branch. Leaf-sheath oral hairs setose; 15 mm long. Leaf-sheath auricles erect; 1 mm long. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2–0.3 cm long. Leaf-blades oblong; 20–23 cm long; 30–35 mm wide. Leaf-blade venation with 14–16 secondary veins. Leaf-blade apex attenuate.

INFLORESCENCE Synflorescence bractiferous; clustered at the nodes; in globose clusters; dense; pubescent on internodes; 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 2 fertile florets; with a barren rhachilla extension. Spikelets obovate; laterally compressed; obtuse; 3 mm long; breaking up at maturity; disarticulating above glumes but not between florets. Rhachilla internodes suppressed between florets.

GLUMES Glumes several; 2–3 empty glumes; persistent; similar; shorter than spikelet. Upper glume oblate; 2–2.2 mm long; 0.6 length of adjacent fertile lemma; chartaceous; without keels; 5 -veined. Upper glume lateral veins prominent. Upper glume surface pubescent. Upper glume margins ciliate. Upper glume apex obtuse.

FLORETS Fertile lemma oblate; 3.5–4 mm long; chartaceous; without keel; 5 -veined. Lemma surface pubescent. Lemma margins pubescent. Lemma apex obtuse. Palea tightly convolute around flower; 3 mm long. Palea surface pubescent; hairy on flanks.

FLOWER Lodicules 3; 0.5 mm long; ciliate. Anthers 6; 1 mm long. Stigmas 2.

FRUIT Caryopsis with fleshy pericarp; orbicular; isodiametric.

DISTRIBUTION Asia-tropical: Indo-China.

NOTES Bambuseae. Nguyen & Tran 2011.

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