Poaceae
Trisetum

Trisetum yunnanense Chrtek

First published in Folia Geobot. Phytotax. 25: 335 (1990)
This species is accepted
The native range of this species is China (Yunnan). It is a perennial and grows primarily in the temperate 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: threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Stolons present. Culms 26-35 cm long; 1.5 mm diam.; 2-3 -noded. Culm-internodes smooth; distally glabrous. Leaf-sheaths 9-14 cm long; pubescent; outer margin hairy. Ligule a ciliolate membrane; 1.5-3 mm long. Leaf-blades 4-10 cm long; 2-3 mm wide. Leaf-blade surface glabrous, or puberulous. Leaf-blade margins ciliate. Leaf-blade apex attenuate.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; lanceolate; 7-9 cm long; 1.5-3 cm wide. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 2-6 mm long; scabrous.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets oblong, or cuneate; laterally compressed; 6.5-9 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent. Floret callus pubescent. Floret callus hairs 0.8 length of lemma.
Fertile
Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets oblong, or cuneate; laterally compressed; 6.5-9 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes pubescent. Floret callus pubescent. Floret callus hairs 0.8 length of lemma.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; dissimilar; shorter than spikelet; thinner than fertile lemma; gaping. Lower glume lanceolate; 4-5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein scaberulous. Lower glume lateral veins absent. Lower glume apex acuminate; mucronate. Upper glume elliptic; 5-6.5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex acuminate; mucronate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 6.5-7 mm long; chartaceous; keeled; 5 -veined. Lemma midvein scaberulous. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5-0.66 way up back of lemma; curved, or geniculate; 12-16 mm long overall; without a column, or with a straight or slightly twisted column. Palea 6.5 mm long; hyaline. Palea keels scaberulous; adorned above; with 0.66 of their length adorned. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 1.8-2.2 mm long. Ovary pubescent on apex.
Distribution
Asia-temperate: China.
Reference
Aveneae. Chrtek 2006.
[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

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2026. 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 2026. 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