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This species is accepted, and its native range is Japan (C. & N. Honshu).

[GB]
Morphology General Habit
Perennial; caespitose; clumped loosely. Rhizomes short. Culms slender; 26-65 cm long; 1-1.2 mm diam.; 3-5 -noded. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths longer than adjacent culm internode; glabrous on surface. Ligule an eciliate membrane; 2-6 mm long; truncate, or obtuse, or acute. Leaf-blades linear, or lanceolate; 12-20 cm long; 4-10 mm wide; aromatic. Leaf-blade surface smooth; pubescent; sparsely hairy; hairy adaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; loose; 5-10 cm long; 1-3.5 cm wide. Primary panicle branches 2 -nate; 1-3 cm long. Panicle branches smooth. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; compressed slightly; 5-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.7-1 mm long.
Fertile
Spikelets comprising 2 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic, or oblong; laterally compressed; compressed slightly; 5-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes elongated below proximal fertile floret. Rhachilla elongation 0.7-1 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; dissimilar; exceeding apex of florets; thinner than fertile lemma. Lower glume ovate; 3-4 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 5-7 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets dissimilar; barren; without significant palea; attached to and deciduous with the fertile. Lemma of lower sterile floret oblong; 5-7 mm long; chartaceous; without keels; 5 -veined; pilose; dentate; 2 -fid; obtuse; awned. Awn of lower sterile floret dorsal; arising 0.5 way up back of lemma; 1.5-2 mm long. Lemma of upper sterile floret oblong; 5-7 mm long; chartaceous; pilose; dentate; 2 -fid; obtuse; awned. Awn of upper sterile floret dorsal; arising 0.25 way up back of lemma; geniculate; 4-5 mm long. Fertile lemma elliptic, or ovate; 2.5-3 mm long; cartilaginous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma margins convolute; covering most of palea. Lemma apex emarginate. Palea oblong; 1 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules absent. Anthers 2; 2-2.5 mm long. Stigmas 2; protogynous; pubescent.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Asia-temperate: eastern Asia.
Reference
Aveneae. Koyama 1994.

Native to:

Japan

Anthoxanthum japonicum (Maxim.) Hack. ex Matsum. appears in other Kew resources:

First published in Bot. Mag. (Tokyo) 11: 443 (1897)

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