Poaceae
Agrostis

Agrostis masafuerana Pilg.

First published in Repert. Spec. Nov. Regni Veg. 16: 388 (1920)
This species is accepted
The native range of this species is Juan Fernández Islands. It is a perennial and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Perennial; caespitose. Rhizomes short. Culms erect; 30-40 cm long; 3-4 -noded. Culm-internodes brown; distally glabrous. Lateral branches lacking. Leaf-sheaths 2-8 cm long; striately veined; glabrous on surface. Ligule an eciliate membrane; 3-3.5 mm long; erose; acute. Leaf-blades 3-10 cm long; 2-3 mm wide. Leaf-blade surface smooth. Leaf-blade margins scaberulous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; exserted, or embraced at base by subtending leaf. Panicle contracted; linear, or oblong; 7-12 cm long; 1-2 cm wide. Panicle branches smooth. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1.5-4.5 mm long.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3.5-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus sparsely hairy; hairy on the margins.
Fertile
Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets elliptic; laterally compressed; 3.5-4.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus sparsely hairy; hairy on the margins.
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 surface smooth, or asperulous. Lower glume apex acuminate. Upper glume lanceolate; 3.5-4.5 mm long; membranous; purple; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume lateral veins distinct. Upper glume surface smooth, or asperulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma elliptic; 1.5-2 mm long; hyaline; without keel; 5 -veined. Lemma surface scaberulous; rough on veins. Lemma apex erose; truncate; awned; 1 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; straight; 0.5-1.2 mm long overall; not or scarcely exserted from spikelet. Palea 0.2-0.3 mm long; 0.1-0.15 length of lemma; 0 -veined. Palea apex dentate; 3 -fid.
Morphology Reproductive morphology Flowers
Lodicules 2; 0.4-0.5 mm long; membranous. Anthers 3; 0.8-1 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; 1-1.5 mm long. Hilum elliptic. Endosperm farinose.
Distribution
South America: southern South America.
Reference
Aveneae. Rugolo & Molina 2001.
[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

  • 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 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