Poaceae
Eragrostis

Eragrostis lutescens Scribn.

First published in Circ. Div. Agrostol. U.S.D.A. 9: 7 (1899)
This species is accepted
The native range of this species is W. & W. Central U.S.A. It is an annual 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
Annual; caespitose. Culms erect, or geniculately ascending; 10-20 cm long. Leaf-sheaths glandular; pilose. Ligule a fringe of hairs; 0.5 mm long. Leaf-blades 3-9 cm long; 1-2 mm wide; glandular. Leaf-blade surface scabrous; rough adaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 2-10 cm long; 0.8-2 cm wide. Primary panicle branches appressed, or ascending; 1-3.5 cm long. Panicle branches glandular; scabrous; glabrous in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-3 mm long; glandular; scabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 6-10 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5-7.5 mm long; 1-1.5 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas.
Fertile
Spikelets comprising 6-10 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5-7.5 mm long; 1-1.5 mm wide; breaking up at maturity; rhachilla persistent; retaining paleas.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes deciduous; similar; shorter than spikelet. Lower glume ovate; 1 mm long; 0.66 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume ovate; 1.5 mm long; 0.75-1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 1.5-2 mm long; membranous; eglandular; keeled; 3 -veined. Lemma midvein without distinctive roughness, or scaberulous. Lemma lateral veins distinct. Lemma apex acute. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; cuneate; fleshy.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; 0.7 mm long.
Distribution
North America: northwest USA and southwest .
Reference
Eragrostideae. Gr SW US 1994.
[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

    • '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 2025. 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 2025. 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