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This species is accepted, and its native range is Sumatera.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial; caespitose. Rhizomes short; pachymorph. Culms erect; pendulous at the tip; 800-1000 cm long; 20-30 mm diam.; woody; without nodal roots. Culm-internodes terete; thin-walled; 45-55 cm long; mid-green and yellow; striped; distally glabrous, or hispid. Lateral branches dendroid; arising from mid culm. Bud complement 1. Branch complement several; in a clump; with 1 branch dominant; thinner than stem. Culm-sheaths persistent, or deciduous; 12.6-13.5 cm long; 2 times as long as wide; hispid; with white hairs, or black hairs; truncate at apex; auriculate; setose on shoulders; shoulders with 7 mm long hairs. Culm-sheath ligule 3-4 mm high; entire, or ciliolate. Culm-sheath blade triangular; narrower than sheath; erect; 7-12.4 cm long; 2.5-3 mm wide; glabrous on surface. Leaf-sheath oral hairs lacking. Leaf-sheath auricles erect; 0.3-0.5 mm long. Ligule an eciliate membrane; 3 mm long. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades deciduous at the ligule; lanceolate; 15-26 cm long; 16-30 mm wide. Leaf-blade surface glabrous. Leaf-blade margins ciliate. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Synflorescence bractiferous; clustered at the nodes; in untidy tufts; with spathaceous subtending bracts; with axillary buds at base of spikelet; prophyllate below lateral spikelets; leafless between clusters.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 10-15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 1-3 mm long; glabrous.
Fertile
Spikelets comprising 4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 10-15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite; 1-3 mm long; glabrous.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes several; 3 empty glumes; persistent; similar; shorter than spikelet; similar to fertile lemma in texture. Lower glume ovate; 4 mm long. Lower glume apex acute. Upper glume ovate; 6 mm long. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 8-9 mm long; without keel. Lemma apex acute. Palea 8-9 mm long. Palea apex acute. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 3; membranous; ciliate. Anthers 6; 5-6 mm long; yellow. Stigmas 3. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
Asia-tropical: Malesia.
Reference
Bambuseae. Widjaja 2002.

Native to:

Sumatera

Bambusa riauensis Widjaja appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Widjaja, E.A. [4006], Sumatera K000290514 isotype
Widjaja, E.A. [4006], Sumatera K000290515 isotype

First published in Reinwardtia 11: 65 (1997)

Accepted by

  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0