1. Family: Poaceae Barnhart
    1. Genus: Poa L.
      1. Poa napensis Beetle

        This species is accepted, and its native range is California (Napa County).

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Culms 20-60 cm long. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths open for most of their length. Ligule an eciliate membrane; 1 mm long. Leaf-blades filiform; involute; 20-30 cm long; 1.5-2.5 mm wide. Leaf-blade surface scabrous.
    Inflorescences
    Inflorescence a panicle. Panicle contracted; lanceolate; 3-8 cm long. Spikelets solitary. Fertile spikelets pedicelled.
    Spikelets
    Spikelets comprising 2-4 fertile florets; with diminished florets at the apex. Spikelets ovate; laterally compressed; 6-7 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 ovate; laterally compressed; 6-7 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.
    Glume
    Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3 mm long; 0.85 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume elliptic; 3.5 mm long; 0.9 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.
    Florets
    Fertile lemma ovate; 4 mm long; membranous; keeled; 5 -veined. Lemma surface scaberulous, or scabrous. Lemma apex acute. Palea 1 length of lemma. Apical sterile florets resembling fertile though underdeveloped.
    Flowers
    Lodicules 2; membranous. Anthers 3.
    Fruits
    Caryopsis with adherent pericarp. Hilum punctiform.
    Distribution
    North America: southwest USA.
    Reference
    Poeae. Man Gr US 1994.

    Distribution

    Native to:

    California

    Poa napensis Beetle appears in other Kew resources:

    First published in Leafl. W. Bot. 4: 289 (1946)

    Accepted by

    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.
    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Kew Backbone Distributions
    • Flora of North America Editorial Committee (2007). Flora of North America North of Mexico 24: 1-908. Oxford University Press, New York, Oxford.

    Sources

    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 Selected Plant Families 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

    Kew Names and Taxonomic Backbone
    The International Plant Names Index and World Checklist of Selected Plant Families 2018. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
    © Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0