Poaceae
Agrostis

Agrostis gracililaxa Franco

First published in Bot. J. Linn. Soc. 76: 336 (1978)
This species is accepted
The native range of this species is Azores. It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Culms geniculately ascending; 10-20 cm long. Ligule an eciliate membrane; 0.5-1.5 mm long. Leaf-blades flat, or involute; 1-10 cm long; 0.5-4 mm wide. Leaf-blade surface scaberulous. Leaf-blade apex acuminate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; 1.5-4.5 cm long. Primary panicle branches spreading (at anthesis). Panicle branches scaberulous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform; terete; 1 length of fertile spikelet; smooth.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or oblong; laterally compressed; 2-3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or sparsely hairy. Floret callus hairs 0-0.3 mm long.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate, or oblong; laterally compressed; 2-3 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus glabrous, or sparsely hairy. Floret callus hairs 0-0.3 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; firmer than fertile lemma; shiny; gaping. Lower glume lanceolate; 1 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute; muticous, or mucronate. Upper glume lanceolate; 1.5 length of adjacent fertile lemma; membranous; 1-keeled; 1 -veined. Upper glume primary vein scaberulous. Upper glume lateral veins absent. Upper glume apex acute; muticous, or mucronate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic to oblong; 1.3-2 mm long; hyaline; without keel; 5 -veined. Lemma lateral veins prominent; excurrent, or extending close to apex. Lemma surface smooth, or scaberulous; glabrous, or pubescent. Lemma apex obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.1-0.2 way up back of lemma; geniculate; 2-4 mm long overall; with twisted column. Palea 0.6-0.8 length of lemma; hyaline; 2 -veined.
Morphology Reproductive morphology Flowers
Lodicules 2; lanceolate; membranous. Anthers 3; 1-1.2 mm long. Stigmas 2.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum linear. Endosperm farinose.
Distribution
Africa: Macaronesia.
Reference
Aveneae. Fl Eur 1997.
[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