Poaceae
Agrostis

Agrostis ambatoensis Asteg.

First published in Bol. Soc. Argent. Bot. 20: 271 (1982)
This species is accepted
The native range of this species is NW. Argentina. It is a perennial and grows primarily in the subtropical 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: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial. Culms 3-5 cm long; 1 -noded. Culm-internodes distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 0.2-0.3 mm long; erose. Leaf-blades flat, or conduplicate; 1-2 cm long; 0.5 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 7-9 fertile spikelets. Panicle open; oblong; 1-2 cm long; bearing few spikelets. Primary panicle branches 3-6 in number. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.4-1.5 mm long; glabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.8-2.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 1.8-2.2 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 2-2.2 mm long; 1 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 lanceolate; 1.8-2.1 mm long; 1.5-1.7 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 elliptic; 1.2-1.3 mm long; hyaline; without keel; 5 -veined. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 0.6-1 mm long overall; not or scarcely exserted from spikelet. Palea 0.2 mm long; hyaline; 0 -veined.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.2 mm long; membranous. Anthers 3.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; 1 mm long. Hilum linear.
Distribution
South America: southern South America.
Reference
Aveneae. Asteg 1997.
[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

  • 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

  • World Checklist of Vascular plants (WCVP)

    • 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