Poaceae
Agrostis

Agrostis imberbis Phil.

First published in Anales Univ. Chile 94: 11 (1896)
This species is accepted
The native range of this species is Colombia (Boyacá), Peru to Argentina. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose; clumped densely. Rhizomes elongated. Butt sheaths yellow. Culms geniculately ascending; 30-65 cm long. Leaf-sheaths 3-11 cm long; antrorsely scabrous. Ligule an eciliate membrane; 5-8 mm long; scaberulous on abaxial surface; entire, or lacerate; acute. Leaf-blades filiform; conduplicate, or convolute; 3-11 cm long; 0.5-1 mm wide; stiff; mid-green. Leaf-blade surface scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; elliptic; 8-15 cm long; contracted about primary branches. Primary panicle branches whorled at most nodes. Panicle axis smooth. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scaberulous; puberulous; tip widened.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.8-3.1 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or sparsely hairy.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.8-3.1 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or sparsely hairy.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; purple; 1-keeled; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.8-3.1 mm long; 1.2-1.3 length of adjacent fertile lemma; membranous; purple; 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; 2.1-2.5 mm long; hyaline; without keel; 5 -veined. Lemma surface scaberulous; rough above and on veins. Lemma apex truncate; muticous, or mucronate. Principal lemma awn dorsal. Palea absent or minute.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.4 mm long; membranous. Anthers 3; 1.2-1.8 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ovoid; 1.5-1.6 mm long. Hilum linear.
Distribution
South America: western South America and southern South America.
Reference
Aveneae. Fl Pat 1995.
[GB]

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

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 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 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0