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This species is accepted, and its native range is Japan (Honshu: Izushichito, Kyushu).

[GB]
Morphology General Habit
Perennial; caespitose; clumped loosely. Rhizomes short. Culms geniculately ascending; 20-70 cm long; 0.7-1.2 mm diam.; 3-5 -noded. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface, or pilose. Leaf-sheath oral hairs ciliate. Leaf-sheath auricles erect. Ligule an eciliate membrane; 1-2 mm long. Leaf-blades 10-30 cm long; 3-10 mm wide; stiff; glaucous. Leaf-blade venation prominent. Leaf-blade surface smooth.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 5-15 cm long; 1-2 cm wide. Primary panicle branches 2-4 -nate; 2-3.5 cm long. Panicle branches smooth to scabrous. 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; 3.5-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 0.5 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets lanceolate; laterally compressed; 3.5-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded. Floret callus hairs 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; 3.5-5 mm long; 1 length of upper glume; membranous; 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; 3.5-5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 3-4.5 mm long; membranous; without keel; 5 -veined. Lemma lateral veins extending close to apex. Lemma apex erose; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5-0.66 way up back of lemma; straight; 3-4 mm long overall; without a column.
Morphology Reproductive morphology Flowers
Lodicules 2. Anthers 3; 1.8-2 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 2-2.2 mm long. Hilum punctiform. Disseminule comprising a floret.
Distribution
Asia-temperate: eastern Asia.
Reference
Aveneae. Koyama 1994.

Native to:

Japan

Calamagrostis autumnalis Koidz. appears in other Kew resources:

First published in Bot. Mag. (Tokyo) 39: 18 (1925)

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.
  • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.

Literature

Kew Backbone Distributions

  • Koyama, T. (1987). Grasses of Japan and its neighboring regions: an identification manual: 1-570. Kodansha, Tokyo, Japan.

GrassBase - The Online World Grass Flora
http://creativecommons.org/licenses/by-nc-sa/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