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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 undulatum

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms 30 mm diam.; woody. Culm-internodes terete; hollow. Lateral branches dendroid. Culm-sheaths 8–16 cm long; pubescent; with appressed hairs; with tawny hairs; convex at apex; auriculate; with 10 mm high auricles; ciliate on shoulders; shoulders with curved hairs; shoulders with 7 mm long hairs. Culm-sheath ligule 0.5–1 mm high; entire. Culm-sheath blade ovate; erect; 9–11 cm long; 45 mm wide; glabrous on surface; acuminate. Leaf-sheath oral hairs setose; 10–15 mm long. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades lanceolate; 10–40 cm long; 15–45 mm wide. Leaf-blade surface glabrous. Leaf-blade apex attenuate.

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; 40 cm long overall.

Fertile spikelets sessile.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets; with diminished florets at the apex. Spikelets lanceolate; subterete; 14 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2 mm long.

GLUMES Glumes several; persistent; shorter than spikelet.

FLORETS Fertile lemma lanceolate; 10 mm long; chartaceous; without keel; 17 -veined. Lemma margins convolute; covering most of palea; ciliate. Lemma apex acute; awned; 1 -awned. Principal lemma awn 2 mm long overall. Palea tightly convolute around flower; 15–16 mm long; chartaceous; 12 -veined; 2-keeled. Palea keels ciliate; adorned above. Palea apex dentate; 2 -fid. Apical sterile florets 1 in number; rudimentary.

FLOWER Lodicules 3; 4 mm long; ciliate. Anthers 6; 4 mm long. Stigmas 3. Ovary with a steeple-like appendage.

FRUIT Caryopsis with free brittle pericarp.

DISTRIBUTION Asia-tropical: Malesia.

NOTES Bambuseae. Dransfield 1996.

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