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This species is accepted, and its native range is Tibet to China (W. Sichuan).
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial. Culms 20-35 cm long; 2-4 -noded. Culm-internodes terete; smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths striately veined; smooth; glabrous on surface. Ligule an eciliate membrane; 5-9 mm long. Leaf-blades ascending; 4-8 cm long; 4 mm wide; glaucous. Leaf-blade surface ribbed; grooved adaxially; scaberulous; rough on both sides. Leaf-blade margins scaberulous. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; linear; continuous, or interrupted; 6-9 cm long; 1.7 cm wide. Panicle axis scaberulous. Panicle branches smooth, or scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth, or scaberulous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.33-0.5 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.5-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.33-0.5 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; reaching apex of florets, or exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 4.5-5.5 mm long; 1.1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume elliptic; 4-5 mm long; 1 length of adjacent fertile lemma; membranous; purple; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic; 4.5 mm long; 1.6-1.8 mm wide; membranous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; straight; 4-5 mm long overall. Palea 3 mm long; 2 -veined. Rhachilla extension 2 mm long; pilose; with 2 mm long hairs.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 3; 2-2.5 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Asia-temperate: China.
Reference
Aveneae. Bor 1996.

Native to:

China South-Central, Tibet

Calamagrostis borii Tzvelev appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Walton, H.J. [s.n.], Tibet K000357676 Unknown type material
Walton, H.J. [s.n.], Tibet K000838290
Walton, H.J. [s.n.], Tibet K000357677 Unknown type material
Walton, H.J. [s.n.], Tibet K000357678 Unknown type material

First published in Trudy Bot. Inst. Akad. Nauk S.S.S.R., Rast. Tsentral. Azii 4: 83 (1968)

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.

Literature

Kew Backbone Distributions

  • Wu, Z. & Raven, P.H. (eds.) (2006). Poaceae Flora of China 22: 1-733. Missouri Botanical Garden Press, St. Louis.

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