Poaceae
Poa

Poa attenuata Trin.

First published in Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans 2: 527 (1835)
This species is accepted
The native range of this species is E. European Russia to Temp. Asia and Himalaya. 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: not threatened. Confidence: confident
[AERP]

Morphology General Habit
Perennial; caespitose. Butt sheaths herbaceous. Culms erect; (10-)25-50 cm long; with 0.25-0.33 of their length below uppermost node. Culm-internodes terete; smooth. Lateral branches lacking. Leaves mostly basal. Ligule an eciliate membrane; 1.5-2.5 mm long; obtuse. Leaf-blades involute, or convolute; 1.5-10 cm long; 1-3 mm wide. Leaf-blade margins scabrous.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle contracted; oblong; 2.5-9 cm long; bearing few spikelets. Primary panicle branches ascending; 1-2 -nate. Panicle branches scabrous. Spikelets solitary. Fertile spikelets pedicelled.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate, or cuneate; laterally compressed; 4-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.
Fertile
Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate, or cuneate; laterally compressed; 4-5.5 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; shorter than spikelet. Lower glume ovate; 2.3-3.3 mm long; 1 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume ovate; (2.5-)3-3.5 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
Morphology Reproductive morphology Flowers Florets
Fertile lemma ovate; oblong in profile; (2-)2.3-3(-3.2) mm long; membranous; keeled; 5 -veined. Lemma midvein ciliate. Lemma margins ciliate. Lemma apex acute. Palea 0.9 length of lemma. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.
Morphology Reproductive morphology Flowers
Lodicules 2; membranous. Anthers 3; 1-1.8 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp. Hilum punctiform.
Distribution
Asia-temperate: Siberia, Soviet far east, Soviet Middle Asia, China, and Mongolia. Asia-tropical: India.
Reference
Poeae. Fl Pak.
[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