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This species is accepted, and its native range is Taiwan, Philippines, New Guinea.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial; caespitose; clumped densely. Rhizomes short. Culms erect; 30-50 cm long; 0.8-1.5 mm diam.; 1-2 -noded. Culm-internodes smooth. Leaves mostly basal. Leaf-sheaths 2-5 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 0.7-3 mm long. Leaf-blades filiform; involute; 15-30 cm long; 2-3 mm wide; stiff. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle smooth, or scaberulous above. Panicle contracted; linear, or lanceolate; 6-20 cm long; 0.7-1.6 cm wide. Primary panicle branches appressed; 1-6 cm long; bearing spikelets almost to the base. Panicle branches scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 4.8-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. 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; 4.8-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.33-0.5 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 4.8-5.5 mm long; 1 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate. Upper glume lanceolate; 4.8-6.5 mm long; 1.2-1.4 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 4-4.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma surface asperulous. Lemma apex entire; acuminate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25-0.33 way up back of lemma; geniculate; 5-6 mm long overall; with twisted column. Rhachilla extension 1 mm long; pilose.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 3; 1-1.2 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform. Disseminule comprising a floret.
Distribution
Asia-temperate: eastern Asia. Asia-tropical: Malesia and Papuasia.
Reference
Aveneae. Koyama 1994.

Native to:

New Guinea, Philippines, Taiwan

Calamagrostis filifolia Merr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Sonster, J. [455], New Guinea K000290483 holotype
Sonster, J. [455], New Guinea K000290484 isotype
Merrill, E.D. [4537], Philippines K000290486 isolectotype

First published in Philipp. J. Sci. 1(Suppl.): 179 (1906)

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