Poaceae
Bromus

Bromus porteri (Coult.) Nash

First published in Bull. Torrey Bot. Club 22: 512 (1895)
This species is accepted
The native range of this species is W. & Central Canada to W. & Central U.S.A. It is a perennial and grows primarily in the temperate biome.

Descriptions

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]

Morphology General Habit
Perennial. Culms 30-100 cm long. Culm-internodes distally glabrous. Culm-nodes glabrous, or pubescent. Leaf-sheaths glabrous on surface, or pilose. Ligule an eciliate membrane; 2.5 mm long; truncate, or obtuse. Leaf-blades 4-8 mm wide. Leaf-blade surface glabrous, or pilose; hairy adaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; nodding; 7-15 cm long. Primary panicle branches drooping. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 6-10 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12-15 mm long; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 6-10 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 12-15 mm long; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; shorter than spikelet. Lower glume lanceolate; membranous; without keels; 3 -veined. Lower glume surface pubescent. Upper glume lanceolate; membranous; without keels; 3 -veined. Upper glume surface pubescent.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 8-14 mm long; chartaceous; without keel; 5 -veined. Lemma surface pubescent, or pilose. Lemma apex awned; 1 -awned. Principal lemma awn subapical; 1-3.5 mm long overall. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 2-3 mm long. Ovary with a fleshy appendage above style insertion; pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; hairy at apex.
Distribution
North America: western Canada, northwest USA, southwest USA, south-central USA, and Mexico.
Reference
Bromeae. Pavlick 2004.
[GB]

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

    • 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 2026. 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 2026. 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