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

[GB]
Morphology General Habit
Perennial. Culms geniculately ascending; 50-60 cm long. Lateral branches lacking. Leaf-sheaths retrorsely scabrous; glabrous on surface. Ligule an eciliate membrane; 1-2 mm long. Leaf-blades flat, or involute; 15-20 cm long; 5-10 mm wide; 2-4 cm long at summit of culm. Leaf-blade surface scabrous; rough adaxially. Leaf-blade apex hardened.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; oblong; 8-15 cm long. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 4-5 mm long; 0.5-0.6 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 4-5 mm long; 0.5-0.6 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 7 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 7 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 3-4 mm long; membranous; without keel; 5 -veined. Lemma apex dentate; 4 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; curved; 5 mm long overall. Palea 2.5-3 mm long; hyaline; 2 -veined. Palea keels scaberulous. Rhachilla extension 0.5-2 mm long; pilose.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 3. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Pacific: north-central.
Reference
Aveneae. Hitchcock 1993.

Native to:

Hawaii

Calamagrostis expansa (Munro ex Hillebr.) Hitchc. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
s.coll. [s.n.], Hawaii K000838377 Unknown type material

First published in Mem. Bernice Pauahi Bishop Mus. 8: 149 (1922)

Accepted by

  • Clayton, W.D. & Snow, N. (2010). A key to Pacific Grasses: 1-107. Kew Publishing, Royal Botanic Gardens, Kew.
  • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

Literature

Kew Backbone Distributions

  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

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