Poaceae
Agrostis

Agrostis tibestica Miré & Quézel

First published in Bull. Soc. Bot. France 106: 137 (1959)
This species is accepted
The native range of this species is N. Chad. It is a perennial and grows primarily in the desert or dry shrubland biome.

Descriptions

Morphology General Habit
Perennial; caespitose; clumped densely. Butt sheaths persistent and investing base of culm; with compacted dead sheaths. Culms 30-60 cm long; 3-5 -noded. Leaf-sheaths 3-12 cm long. Ligule an eciliate membrane; 5-6 mm long. Leaf-blades flat; 5-7.5 cm long; 2.5-3 mm wide. Leaf-blade surface scaberulous; glabrous. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle spiciform; linear. Panicle axis pubescent. Panicle branches pubescent. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 0.6-0.8 mm long; pubescent; tip widened.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 2.5-3 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; 2.5-3 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; gaping. Lower glume lanceolate; 2.4-2.6 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 margins ciliolate. Lower glume apex acute. Upper glume lanceolate; 2.4-2.6 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scabrous. Upper glume lateral veins absent. Upper glume surface asperulous. Upper glume margins ciliolate. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 2.5 mm long; cartilaginous; without keel; 5 -veined. Lemma lateral veins obscure; excurrent. Lemma surface scaberulous; rough above; glabrous. Lemma apex dentate; 4 -fid; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; geniculate; 1.5 mm long overall; with a straight or slightly twisted column. Palea 0.8-1.1 mm long; 0.5 length of lemma; hyaline; 2 -veined.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.5-0.6 mm long; membranous. Anthers 3; yellow.
Distribution
Africa: northeast tropical.
Reference
Aveneae. Mire 2005.
[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