Trisetaria linearis Forssk.

First published in Fl. Aegypt.-Arab.: lx, 27 (1775)
This species is accepted
The native range of this species is Tunisia to Iran. It is an annual and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Annual. Culms erect, or geniculately ascending; 10-30 cm long. Leaf-sheaths inflated; pubescent; with reflexed hairs. Ligule an eciliate membrane. Leaf-blades 1-6 cm long; 1-2 mm wide. Leaf-blade surface pubescent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; subtended by an inflated leaf-sheath; embraced at base by subtending leaf. Panicle spiciform; linear; 5-10 cm long; 0.5-1 cm wide. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 6 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus pubescent.
Fertile
Spikelets comprising 1 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 6 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; shiny; gaping. Lower glume lanceolate; 6 mm long; 1 length of upper glume; membranous; 1-keeled; 1-3 -veined. Lower glume primary vein scaberulous. Lower glume apex acuminate. Upper glume lanceolate; 6 mm long; 1.2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 5 mm long; membranous; keeled; 5 -veined. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.75 way up back of lemma; geniculate; 8-10 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 3-5 mm long; shorter than principal. Palea gaping; hyaline. Palea keels scaberulous. Rhachilla extension 0.2-0.3 length of fertile floret; pilose.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 0.5 mm long. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; lanceolate. Embryo 0.15 length of caryopsis. Hilum punctiform.
Distribution
Africa: north. Asia-temperate: Caucasus, western Asia, and Arabia.
Reference
Aveneae. Fl Iraq.
[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
  • Kew Science Photographs

    • Copyright applied to individual images