Skip to main content
This species is accepted, and its native range is W. U.S.A.
A specimen from Kew's Herbarium

[GB]
Morphology General Habit
Perennial; caespitose; clumped loosely. Culms erect; 90-150 cm long; 2-4 -noded. Culm-internodes distally pruinose, or pubescent. Culm-nodes brown; pubescent. Leaf-sheaths tubular for much of their length; 3.5-11 cm long; mostly shorter than adjacent culm internode; pilose. Leaf-sheath oral hairs ciliate; 2-3 mm long. Ligule an eciliate membrane; 1-3 mm long; glabrous on abaxial surface, or pilose on abaxial surface; erose; obtuse. Leaf-blades 7-24 cm long; 3-12 mm wide. Leaf-blade surface glabrous. Leaf-blade margins smooth, or scaberulous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate, or pyramidal; 7-13.5 cm long; 2-10 cm wide. Primary panicle branches appressed, or ascending, or spreading; 1-2(-3) -nate; 3-7.5 cm long; bearing 1-5 fertile spikelets on each lower branch. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 20-37 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas.
Fertile
Spikelets comprising 3-9 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 20-37 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes eventually visible between lemmas.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; shorter than spikelet. Lower glume lanceolate; 5-9 mm long; 0.75 length of upper glume; membranous; without keels; 1(-3) -veined. Lower glume lateral veins absent, or obscure. Lower glume surface glabrous. Lower glume apex acute. Upper glume lanceolate; 7-11 mm long; 0.75 length of adjacent fertile lemma; membranous; without keels; 3 -veined. Upper glume surface glabrous. Upper glume apex acute; muticous, or mucronate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 9-15 mm long; chartaceous; without keel, or keeled; lightly keeled; 5-7 -veined. Lemma lateral veins obscure. Lemma surface glabrous, or puberulous. Lemma apex dentate; 2 -fid; with lobes 0.1-0.2 mm long; awned; 1 -awned. Principal lemma awn subapical; (4-)5.5-8 mm long overall. Palea 8-11 mm long. Palea surface glabrous, or puberulous; hairy on back and on margins. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 3.5 mm long; yellow, or orange. Ovary with a fleshy appendage above style insertion; pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; linear; 6-9 mm long; dark brown, or purple; hairy at apex; apex fleshy. Hilum linear.
Distribution
North America: northwest USA and southwest .
Reference
Bromeae. Saarela et al 2006.

Native to:

Arizona, California, Nevada, Oregon, Washington

Bromus orcuttianus Vasey appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Cusick, W.C. [2677], Oregon K000913848

First published in Bot. Gaz. 10: 223 (1885)

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.
  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
  • Saarela, J.M., Peterson, P.M. & Váldes-Reyna, J. (2014). A taxonomic revision of Bromus (Poaceae: Pooideae: Bromeae) in México and Central America Phytotaxa 185(1): 1-147.

Literature

Kew Backbone Distributions

  • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

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 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