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

[GB]
Morphology General Habit
Perennial; caespitose; clumped densely. Rhizomes short. Butt sheaths coriaceous; glossy; persistent and investing base of culm. Culms erect; robust; 80-110 cm long; 3-5 mm diam.; 2-5 -noded. Culm-internodes smooth; distally glabrous. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 8-15 mm long; acute. Leaf-blades filiform; flat, or involute; 20-45 cm long; 4-7 mm wide; stiff. Leaf-blade surface ribbed; grooved adaxially; scabrous; rough adaxially. Leaf-blade apex abruptly acute, or acute; hardened.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate, or ovate; 15-25 cm long; 4-5 cm wide; contracted about primary branches. Primary panicle branches 5-10 cm long; bearing spikelets almost to the base. Panicle axis scabrous. Panicle branches smooth, or scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-6 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 8-11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus bearded. Floret callus hairs 3 mm long.
Fertile
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 8-11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite. Floret callus bearded. Floret callus hairs 3 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; with lower narrower than upper; exceeding apex of florets; shiny; gaping. Lower glume lanceolate, or elliptic; 8-11 mm long; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 8-11 mm long; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong, or ovate; 5-5.5 mm long; membranous; shiny; without keel; 7 -veined. Lemma apex dentate; 2 -fid; with lateral lobes bidentate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 7.5-8.5 mm long overall; with a straight or slightly twisted column. Palea oblong; 1 length of lemma; 2 -veined. Palea keels ciliolate. Palea apex dentate; 2 -fid. Rhachilla extension pilose.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1.7 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
Antarctic: Subantarctic islands.
Reference
Aveneae. Hubbard 1999.

Native to:

Tristan da Cunha

Deschampsia robusta C.E.Hubb. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1980 Wace, N.M. [245], Tristan da Cunha K000307875 holotype
Wace [G223] K000298704
Wace [G217] K000298705

First published in Bull. Brit. Mus. (Nat. Hist.), Bot. 8: 391 (1981)

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