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This species is accepted, and its native range is Great Britain (S. & E. England).
Bromus interruptus

[GB]
Morphology General Habit
Annual; culms solitary, or caespitose. Culms erect, or geniculately ascending; 20-100 cm long; 2-4 -noded. Leaf-sheaths pubescent. Ligule an eciliate membrane; 1-2 mm long; erose. Leaf-blades 6-20 cm long; 2-6 mm wide. Leaf-blade surface pubescent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; linear, or oblong; interrupted; equilateral; 2-9 cm long; 1-2 cm wide. Primary panicle branches 0.5-1.5 cm long; bearing 2-3 fertile spikelets on each lower branch. Spikelets in pairs, or in threes. Fertile spikelets sessile; 2-3 in the cluster.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 5-11 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; compressed slightly; 10-15 mm long; 5-8 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 5-11 fertile florets; with diminished florets at the apex. Spikelets oblong, or ovate; laterally compressed; compressed slightly; 10-15 mm long; 5-8 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet; parallel to lemmas. Lower glume oblong; 5-7 mm long; 0.7-0.8 length of upper glume; chartaceous; without keels; 3-7 -veined. Lower glume apex acute. Upper glume elliptic, or ovate; 6-9 mm long; 0.8-1 length of adjacent fertile lemma; chartaceous; without keels; 5-9 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma obovate; 7.5-9 mm long; chartaceous; much thinner on margins; without keel; 7-9 -veined. Lemma lateral veins distinct. Lemma surface pubescent. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn subapical; 4-8 mm long overall; limb scabrous. Palea readily splitting down midline; 0.8-0.9 length of lemma. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1-1.5 mm long. Ovary with a fleshy appendage above style insertion; pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; concealed by floret; hairy at apex; apex fleshy. Hilum linear; 1 length of caryopsis.
Distribution
Europe: northern.
Reference
Bromeae. CEH.

Extinct in:

Great Britain, Netherlands

Introduced into:

Netherlands

Bromus interruptus (Hack.) Druce appears in other Kew resources:

First published in J. Bot. 33: 344 (1895)

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.
  • Humphreys, A.M., Govaerts, R., Ficinski, S.Z., Nic Lughadha, E. & Vorontsova, M.S. (2019). Global dataset shows geography and life form predict modern plant extinction and rediscovery Nature Ecology & Evolution 3: 1043-1047.
  • Le Roux, J.J., Hui, C., Castillo, M.L., Iriondo, J.M., Keet, J.-H., Khapugin, A.A., Médail, F., Rejmánek, M., Theron, G. Yannelli, F.A. & Hirsch, H. (2019). Recent Anthropogenic Plant Extinctions Differ in Biodiversity Hotspots and Coldspots Current Biology 29: 1-7.
  • Tutin, T.G. & al. (eds.) (1980). Flora Europaea 5: 1-452. Cambridge University Press.

Literature

Kew Backbone Distributions

  • Tutin, T.G. & al. (eds.) (1980). Flora Europaea 5: 1-452. Cambridge University Press.

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

Kew Science Photographs
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/