Bromus marginatus Nees ex Steud.

First published in Syn. Pl. Glumac. 1: 322 (1854)
This species is accepted
The native range of this species is W. Canada to Central America. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms erect, or geniculately ascending; 60-90 cm long. Culm-internodes distally pubescent. Leaf-sheaths pilose; with reflexed hairs. Ligule an eciliate membrane; 2-3.5 mm long; erose; obtuse. Leaf-blades 15-25 cm long; 6-12 mm wide. Leaf-blade surface glabrous to pilose; hairy adaxially, or on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 10-30 cm long. Primary panicle branches appressed, or ascending. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 6-9 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; compressed strongly; 25-40 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 6-9 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; compressed strongly; 25-40 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 7-9 mm long; 0.9 length of upper glume; chartaceous; 1-keeled; 3-5 -veined. Lower glume surface smooth, or asperulous; glabrous, or pubescent. Lower glume apex acuminate. Upper glume lanceolate; 9-11 mm long; 0.8-0.9 length of adjacent fertile lemma; chartaceous; 1-keeled; 5-7 -veined. Upper glume surface smooth, or asperulous; glabrous to pubescent. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; laterally compressed; 11-14 mm long; chartaceous; much thinner on margins; keeled; distinctly keeled; 7-9 -veined. Lemma lateral veins distinct. Lemma surface glabrous, or pubescent. Lemma margins eciliate, or pubescent. Lemma apex awned; 1 -awned. Principal lemma awn subapical; 4-7 mm long overall. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1-4 mm long. Ovary with a fleshy appendage above style insertion; pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; apex fleshy.
Distribution
Asia-temperate: China. North America: western Canada, northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, and Mexico.
Reference
Bromeae. Pavlick 2004.
[GB]

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0
  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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 Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0