Poaceae
Leymus

Leymus shanxiensis G.H.Zhu & S.L.Chen

First published in Fl. China 22: 390 (2006)
This species is accepted
The native range of this species is China (Shanxi). It is a perennial and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial. Culms erect; 70-110 cm long; 2-3 mm diam.; 3-4 -noded. Leaves mostly basal. Leaf-sheaths antrorsely scabrous. Ligule an eciliate membrane; 0.8 mm long. Leaf-blades flat, or convolute; 10-25 cm long; 3-5 mm wide; stiff. Leaf-blade surface scabrous; rough adaxially; glabrous, or pubescent; densely hairy; hairy adaxially.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes 1; single; erect; bilateral; 8-15 cm long; 10-13 mm wide. Rhachis flattened; puberulous on surface. Spikelet packing broadside to rhachis. Rhachis internodes 6-20 mm long. Spikelets in pairs. Fertile spikelets sessile; 2 in the cluster.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 5-9 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 18-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5-1.5 mm long; pubescent.
Fertile
Spikelets comprising 5-9 fertile florets; with diminished florets at the apex. Spikelets elliptic; laterally compressed; 18-25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5-1.5 mm long; pubescent.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate; 11-14 mm long; 1 length of upper glume; coriaceous; much thinner on margins; 1-keeled; 3-5(-7) -veined. Lower glume margins ciliate. Lower glume apex setaceously attenuate. Upper glume lanceolate; 11-16 mm long; 1 length of adjacent fertile lemma; coriaceous; with membranous margins; 1-keeled; 3-5(-7) -veined. Upper glume margins ciliolate. Upper glume apex setaceously attenuate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; 10-12 mm long; chartaceous; keeled; 5-7 -veined. Lemma surface pilose. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 1-2 mm long overall. Palea 1 length of lemma; 2 -veined; 2-keeled. Palea keels ciliate. Palea apex emarginate. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Anthers 3; 5 mm long; yellow.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
Distribution
Asia-temperate: China.
Reference
Triticeae. Fl China 2005.
[GB]

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: low confidence
[AERP]

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 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