Poaceae
Agrostis

Agrostis microphylla Steud.

First published in Syn. Pl. Glumac. 1: 164 (1854)
This species is accepted
The native range of this species is W. Canada to Mexico (Baja California). 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. Culms erect; 5-15 cm long. Leaf-sheaths longer than adjacent culm internode. Ligule an eciliate membrane; 2-2.5 mm long. Leaf-blades 1.5-6 cm long; 0.5-2.3 mm wide. Leaf-blade surface scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; linear, or lanceolate; 3-6 cm long; 0.5-0.8 cm wide. Primary panicle branches appressed; 0.5-2 cm long. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3.5-4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.15 length of lemma.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3.5-4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pilose. Floret callus hairs 0.15 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume elliptic; 3.5-4 mm long; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acuminate; awned; 1 -awned. Lower glume awn 1-2 mm long. Upper glume elliptic; 3.5-4 mm long; 1.1-1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous. Upper glume apex acuminate; awned; 1 -awned. Upper glume awn 1-2 mm long.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 3.2-3.5 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins excurrent. Lemma apex truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5-0.6 way up back of lemma; geniculate; 6-7 mm long overall; with twisted column. Palea 0.3 length of lemma; hyaline; 0 -veined; without keels.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum linear. Endosperm farinose.
Distribution
North America: southwest USA and Mexico.
Reference
Aveneae. WDC.
[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