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Descriptions

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

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

Schizostachyum mampouw

HABIT Perennial; caespitose; clumped densely. Rhizomes short; pachymorph. Culms erect; pendulous at the tip; 1000–1500 cm long; 25–30 mm diam.; woody. Culm-internodes terete; hollow; 30–60 cm long. Lateral branches dendroid; arising from mid culm. Branch complement several; in a clump; with subequal branches. Culm-sheaths deciduous; 9.5–10 cm long; 1.5 times as long as wide; pubescent; with white hairs, or tawny hairs; truncate at apex; auriculate; with obtuse auricles; with 1–2 mm high auricles; setose on shoulders; shoulders with 14 mm long hairs. Culm-sheath ligule ciliate. Culm-sheath blade triangular; narrower than sheath; erect; 6.5–9.5 cm long; 15 mm wide; pubescent. Leaf-sheaths pubescent; hairs white. Leaf-sheath oral hairs setose; 9 mm long. Ligule an eciliate membrane; 1 mm long. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 19–33 cm long; 24–50 mm wide. Leaf-blade surface pilose; sparsely hairy; 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 sessile.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 8–16 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes two; persistent; shorter than spikelet. Lower glume ovate; 5–8 mm long. Lower glume apex acuminate. Upper glume ovate; 5–8 mm long; chartaceous. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 9–10 mm long; chartaceous; without keel. Lemma surface glabrous. Lemma apex acuminate. Palea 10–15 mm long; chartaceous; without keels. Palea apex dentate; 2 -fid. Rhachilla extension 2 mm long. Apical sterile florets 1 in number; rudimentary.

FLOWER Lodicules absent. Anthers 6; yellow; anther tip apiculate. Stigmas 3. Ovary with a steeple-like appendage; pubescent all over.

FRUIT Caryopsis with free brittle pericarp.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Widjaja 2002.

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