1. Family: Poaceae Barnhart
    1. Genus: Panicum L.
      1. Panicum longissimum (Mez) Henrard

        This species is accepted, and its native range is Paraguay.

    [GB]
    Habit
    Perennial. Cataphylls evident. Rhizomes elongated. Culms erect; 150-200 cm long. Culm-internodes terete; 30 cm long; distally glabrous. Culm-nodes glabrous. Lateral branches ample. Leaf-sheaths 10-30 cm long; keeled; striately veined; glabrous on surface; outer margin hairy. Ligule a ciliate membrane; 2-2.4 mm long. Collar dark; pubescent. Leaf-blades linear, or lanceolate; 50-80 cm long; 5-9 mm wide; stiff. Leaf-blade surface pubescent; hairy adaxially.
    Inflorescences
    Inflorescence a panicle. Peduncle 40-50 cm long; pubescent above. Panicle contracted; linear; 10-30 cm long; contracted about primary branches. Primary panicle branches appressed. Panicle axis angular; scaberulous. Panicle branches scabrous; glabrous in axils, or pubescent in axils. Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous; glabrous, or ciliate.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2-3.3 mm long; 1.2 mm wide; falling entire; readily shedding fertile florets.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; 2-3.3 mm long; 1.2 mm wide; falling entire; readily shedding fertile florets.
    Glume
    Glumes reaching apex of florets; thinner than fertile lemma. Lower glume ovate; clasping; 1.5-1.7 mm long; 0.5 length of spikelet; membranous; without keels; 5 -veined. Lower glume primary vein scabrous. Lower glume apex acute. Upper glume ovate; 1 length of spikelet; membranous; without keels; 7 -veined. Upper glume primary vein scabrous. Upper glume lateral veins prominent. Upper glume surface pubescent; hairy above; inner surface pubescent. Upper glume apex acute.
    Florets
    Basal sterile florets male; with palea. Lemma of lower sterile floret similar to upper glume; ovate; 1 length of spikelet; membranous; 9 -veined; prominently veined; pubescent; hairy above; acute. Palea of lower sterile floret 2.5 mm long. Fertile lemma ovate; dorsally compressed; 2.4 mm long; 1 mm wide; indurate; yellow; shiny; without keel. Lemma surface smooth. Lemma margins involute. Palea involute; indurate. Palea surface papillose.
    Fruits
    Caryopsis with adherent pericarp.
    Distribution
    South America: southern South America.
    Reference
    Paniceae. Fl Paraguay 1997.

    Distribution

    Native to:

    Paraguay

    Panicum longissimum (Mez) Henrard appears in other Kew resources:

    First published in Meded. Rijks-Herb. 54A: 380 (1927)

    Accepted by

    • Clayton, W.D., Harman, K.T. & Williamson, H. (2006). World Grass Species - Synonymy database The Board of Trustees of the Royal Botanic Gardens, Kew.

    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 2019. 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 2019. 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