Bouteloua gracilis (Kunth) Lag. ex Griffiths

First published in Contr. U.S. Natl. Herb. 14: 375 (1912), nom. cons.
This species is accepted
The native range of this species is W. & Central Canada to Mexico. It is a perennial and grows primarily in the temperate biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/44392665/44423567

Conservation
LC - least concern
[IUCN]

Morphology General Habit
Perennial; caespitose. Culms erect, or decumbent; 25-60 cm long. Culm-nodes glabrous, or pubescent. Ligule a fringe of hairs. Leaf-blades 5-10 cm long; 1-2.5 mm wide.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 1-3(-4); single, or borne along a central axis; spreading; arcuate; unilateral; 1.5-5 cm long. Central inflorescence axis 2-5 cm long; tip without extension, or subulate. Rhachis semiterete; scabrous on surface. Spikelet packing broadside to rhachis; crowded. Spikelets pectinate; solitary. Fertile spikelets sessile.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose.
Fertile
Spikelets comprising 1 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 5-6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; reaching apex of florets; thinner than fertile lemma; gaping. Lower glume lanceolate; 3-3.5 mm long; 0.6 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scabrous; eciliate, or ciliate. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume lanceolate; 5-6 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein smooth to scabrous; eciliate to ciliate. Upper glume lateral veins absent. Upper glume apex setaceously attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 4-6 mm long; coriaceous; keeled; 3 -veined. Lemma surface pubescent. Lemma apex lobed; 3 -fid; with outer lobes shorter and with central lobe bidentate; incised 0.3 of lemma length; awned; 3 -awned. Principal lemma awn from a sinus; 1-3 mm long overall. Lateral lemma awns arising on inner edge of lobes; 0.5-2 mm long; shorter than principal. Palea 2 -veined. Palea keels ciliolate. Palea apex with excurrent keel veins. Rhachilla extension pubescent; hairy at tip. Apical sterile florets 1(-2) in number; barren; cuneate; 0.4 mm long. Apical sterile lemmas lobed; 2 -fid; obtuse; awned; 3 -awned. Apical sterile lemma awns 2-3 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; 2.5-3 mm long. Embryo 0.75 length of caryopsis.
Distribution
North America: western Canada, northwest USA, north-central USA, northeast USA, southwest USA, south-central USA, southeast USA, and Mexico.
Reference
Cynodonteae. Gould.
[GB]

Common Names

English
Blue Grama

Sources

  • 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/
  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/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 Living Collection Database

    • Common Names from Plants and People Africa http://www.plantsandpeopleafrica.com/
  • 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