Poaceae
Poa

Poa tuberifera Faurie ex Hack.

First published in Oesterr. Bot. Z. 52: 451 (1902)
This species is accepted
The native range of this species is Korea (Jejudo), Central & S. Japan. It is a perennial or tuberous geophyte and grows primarily in the temperate biome.

Descriptions

Morphology General Habit
Perennial; culms solitary. Butt sheaths pallid. Culms erect; 15-30 cm long; 0.5-0.8 mm diam.; 2-4 -noded; swollen at the base; forming an ovoid corm. Leaf-sheaths tubular for much of their length; with 0.66-0.8 of their length closed; smooth. Ligule an eciliate membrane; 1 mm long; white; truncate, or obtuse. Leaf-blades 5-10 cm long; 0.7-2 mm wide. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle; comprising 4-15 fertile spikelets. Panicle open; ovate; effuse; 2-15 cm long; 1.5-4 cm wide; bearing few spikelets. Primary panicle branches spreading; 1-2 -nate; 1-5 cm long; bearing 1-5 fertile spikelets on each lower branch. Panicle branches capillary; smooth. Spikelets solitary. Fertile spikelets pedicelled. Pedicels 8-10 mm long; smooth.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate; laterally compressed; 4.5-6 mm long; 2-3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.8-1.5 mm long; smooth. Floret callus glabrous.
Fertile
Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate; laterally compressed; 4.5-6 mm long; 2-3 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.8-1.5 mm long; smooth. Floret callus glabrous.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 2.2-2.5 mm long; 0.75-0.9 length of upper glume; membranous; much thinner on margins; 1-keeled; 1 -veined. Lower glume primary vein smooth. Lower glume lateral veins absent. Lower glume apex acuminate. Upper glume ovate; 2.5-3 mm long; 0.75-0.9 length of adjacent fertile lemma; membranous; with hyaline margins; 1-keeled; 3 -veined. Upper glume primary vein smooth. Upper glume apex acuminate.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; 3-3.5 mm long; 1.4-1.6 mm wide; membranous; much thinner above; much thinner on margins; keeled; 5 -veined. Lemma surface pubescent; hairy below; hairy on veins. Lemma apex acute. Palea 2.2-2.8 mm long. Palea keels scabrous; ciliate; adorned with hairs below. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 0.6-0.8 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Asia-temperate: eastern Asia.
Reference
Poeae. Koyama 1994.
[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: not threatened. Confidence: confident
[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

  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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 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