Poaceae
Trisetopsis

Trisetopsis hirtula (Steud.) Röser & A.Wölk

First published in Schlechtendalia 25: 59 (2013)
This species is accepted
The native range of this species is S. Africa. It is a perennial and grows primarily in the subtropical biome.

Descriptions

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms 50-100 cm long; 2-3 -noded. Lateral branches lacking. Leaf-sheaths smooth; glabrous on surface, or pubescent. Ligule an eciliate membrane; 1 mm long; erose. Leaf-blades filiform; involute; 10-25 cm long; 1-2 mm wide; firm, or flaccid. Leaf-blade surface smooth, or scaberulous; glabrous, or pubescent.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; linear; 10-20 cm long. Primary panicle branches 2 -nate; 2-6 cm long. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 3-5 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 8-11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2 mm long; pilose; hairy above; with 1.5-2 mm long hairs. Floret callus pubescent. Floret callus hairs 0.5 mm long.
Fertile
Spikelets comprising 3-5 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 8-11 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 1.5-2 mm long; pilose; hairy above; with 1.5-2 mm long hairs. Floret callus pubescent. Floret callus hairs 0.5 mm long.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma; shiny. Lower glume lanceolate; 3.5-6 mm long; 0.5-0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume lanceolate; 7 mm long; 0.8-1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma oblong; 7-8.5 mm long; cartilaginous; without keel; 5 -veined. Lemma surface scabrous; rough above. Lemma apex dentate; 2 -fid; awned; 3 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; 12-15 mm long overall; with twisted column. Column of lemma awn 5-7 mm long. Lateral lemma awns arising on apex of lobes; 1 mm long. Palea 6-6.5 mm long. Palea keels ciliolate.
Morphology Reproductive morphology Flowers
Anthers 3; 1.5-2 mm long. Ovary pubescent on apex.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; hairy at apex. Hilum linear.
Distribution
Africa: south.
Reference
Aveneae. Schweickerdt 1993.
[GB]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • 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 2024. 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 2024. 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