Poaceae
Trisetaria

Trisetaria glumacea (Boiss.) Maire

First published in Bull. Soc. Hist. Nat. Afrique N. 33: 93 (1942)
This species is accepted
The native range of this species is Syria to Libya. It is an annual and grows primarily in the subtropical biome.

Descriptions

Morphology General Habit
Annual; caespitose. Culms erect, or geniculately ascending; 6-16 cm long. Culm-nodes black. Leaf-sheaths without keel; pubescent; with reflexed hairs. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades 3-6 cm long; 1-2 mm wide. Leaf-blade surface pilose; hairy on both sides.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; lanceolate, or oblong; continuous; 2-5 cm long; 1-1.5 cm wide. Panicle axis glabrous. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels oblong; scabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 4-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose.
Fertile
Spikelets comprising 2 fertile florets; with a barren rhachilla extension. Spikelets cuneate; laterally compressed; 4-5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pilose.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; shiny; gaping. Lower glume lanceolate, or oblong; 4-5 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume primary vein scabrous. Lower glume apex acuminate; mucronate. Upper glume lanceolate, or oblong; 4-5 mm long; 2 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate; mucronate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate, or oblong; 2-2.5 mm long; membranous; shiny; without keel; 5 -veined. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.25-0.4 way up back of lemma; geniculate; 2.5-3 mm long overall; not or scarcely exserted from spikelet; with twisted column. Lateral lemma awns arising on apex of lobes; 1-1.5 mm long; shorter than principal. Palea gaping; linear; 0.66 length of lemma; hyaline. Palea keels scabrous. Palea apex dentate; 2 -fid. Rhachilla extension pilose.
Morphology Reproductive morphology Flowers
Anthers 3; 1.5 mm long. Ovary glabrous.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Africa: north. Asia-temperate: western Asia.
Reference
Aveneae. Fl Afr N 1993.
[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 2023 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 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0