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This species is accepted, and its native range is Indian Subcontinent to Myanmar.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial. Culms decumbent; 50-90 cm long; rooting from lower nodes. Ligule an eciliate membrane; 2-3 mm long. Leaf-blades 20-40 cm long; 5-8 mm wide; coriaceous. Leaf-blade surface ribbed. Leaf-blade margins cartilaginous; spinulose. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; lanceolate; 10-20 cm long. Spikelets solitary. Fertile spikelets pedicelled. Pedicels tip discoid.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 10-12 mm long; falling entire. Spikelet callus attached transversely.
Fertile
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 10-12 mm long; falling entire. Spikelet callus attached transversely.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes both absent or obscure.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets similar; barren; without significant palea. Lemma of lower sterile floret subulate; 3-4 mm long. Lemma of upper sterile floret subulate; 3-4 mm long. Fertile lemma oblong; 10-12 mm long; coriaceous; keeled; 9 -veined. Lemma apex rostrate; awned; 1 -awned. Principal lemma awn pungent; 3 mm long overall. Palea elliptic; 1 length of lemma; coriaceous; 4 -veined. Palea apex acuminate.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 6.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; oblong; isodiametric; biconvex. Embryo 0.5 length of caryopsis. Hilum linear; 1 length of caryopsis.
Distribution
Asia-tropical: India and Indo-China.
Reference
Oryzeae. WDC.

Native to:

Bangladesh, India, Myanmar, Pakistan

Oryza coarctata Roxb. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
s.coll. [Cat. no. 8636], India K001131047

First published in Fl. Ind. ed. 1832, 2: 206 (1832)

Not 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. [Cited as Porteresia coarctata.]

Literature

Kew Backbone Distributions

  • Ahmed, Z.U. (ed.) (2008). Encyclopedia of Flora and Fauna of Bangladesh 12: 1-505. Asiatic Society of Bangladesh.
  • Cope, T.A. (1982). Flora of Pakistan 143: 1-678. Department of Botany, University of Karachi, Karachi.
  • Karthikeyan, S., Jain, S.K., Nayar, M.P. & Sanjappa, M. (1989). Florae Indicae Enumeratio: Monocotyledonae: 1-435. Botanical Survey of India, Calcutta.

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