Trisetaria dufourei (Boiss. & Reut.) Paunero

First published in Anales Jard. Bot. Madrid 9: 521 (1950)
This species is accepted
The native range of this species is Iberian Peninsula. It is an annual and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Annual; caespitose. Culms erect, or geniculately ascending; 10-35 cm long. Culm-internodes distally glabrous, or pubescent; with reflexed hairs. Leaf-sheaths pubescent; with reflexed hairs. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades 2-5 cm long; 1-3 mm wide. Leaf-blade surface pubescent; hairy on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; lanceolate, or ovate; continuous, or interrupted; 2-6 cm long; 1-2.5 cm wide. Panicle axis pubescent. Panicle branches pubescent. Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 5-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; pubescent; with 0.5 mm long hairs. Floret callus pubescent.
Fertile
Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets cuneate; laterally compressed; 5-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1 mm long; pubescent; with 0.5 mm long hairs. Floret callus pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume linear; 3-5 mm long; 0.7-0.8 length of upper glume; membranous; 1-keeled; 2-3 -veined. Lower glume primary vein scabrous. Lower glume apex acuminate. Upper glume lanceolate; 4.5-6.5 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 4-6 mm long; membranous; without keel; 3-5 -veined. Lemma surface scaberulous. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.66 way up back of lemma; geniculate; 5-7 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 1-2 mm long; shorter than principal. Palea gaping; linear; 3-4 mm long; hyaline. Palea keels scabrous. Palea apex dentate; 2 -fid.
Morphology Reproductive morphology Flowers
Anthers 3; 2 mm long. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Europe: southwestern.
Reference
Aveneae. Paunero 1993.
[GB]

Sources

  • 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 2022. 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 2022. 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