Poaceae
Agrostis

Agrostis subpatens Hitchc.

First published in N.L.Britton & al. (eds.), N. Amer. Fl. 17: 527 (1937)
This species is accepted
The native range of this species is Mexico (Chiapas) to Central America. It is a perennial and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose; clumped densely. Culms erect; 20-50 cm long; 0.5-1 mm diam.; 2 -noded. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths smooth; glabrous on surface. Ligule an eciliate membrane; 3-5 mm long. Leaf-blades erect; filiform; conduplicate; 5-15 cm long; 0.6 mm wide. Leaf-blade surface ribbed; scaberulous; rough abaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Peduncle 3-5 cm long. Panicle open; ovate; 8-9 cm long. Primary panicle branches spreading; 2-8 -nate; whorled at most nodes. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1-2 length of fertile spikelet; scabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.9-3.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.9-3.7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume oblong; 2.9-3.7 mm long; 1.1-1.2 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 oblong; 2.5-3.5 mm long; 1.5 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; 1.7-2.2 mm long; hyaline; without keel. Lemma lateral veins extending close to apex. Lemma apex dentate; 4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.25 way up back of lemma; geniculate; 3 mm long overall; with twisted column. Palea absent or minute.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1-1.5 mm long; purple.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ovoid; 1.3-1.4 mm long. Hilum linear.
Distribution
North America: Mexico. South America: Mesoamericana.
Reference
Aveneae. Fl Costaric 1993.
[GB]

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: low confidence
[AERP]

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