1. Family: Poaceae Barnhart
    1. Genus: Sorghum Moench
      1. Sorghum laxiflorum F.M.Bailey

        This species is accepted, and its native range is Philippines to N. & NE. Australia.

    [GB]
    Habit
    Annual. Culms erect, or geniculately ascending; 100-200 cm long; without nodal roots, or with prop roots. Culm-internodes distally pruinose. Culm-nodes pubescent, or bearded. Leaves cauline. Ligule a ciliolate membrane; 1-2 mm long. Leaf-blades 3-16 mm wide; stiff. Leaf-blade surface glabrous, or hirsute; with tubercle-based hairs. Leaf-blade apex acuminate.
    Inflorescences
    Inflorescence a panicle with branches tipped by a raceme. Panicle contracted; elliptic; 7-17 cm long; 3-4 cm wide. Primary panicle branches not whorled; moderately divided; 1-3 cm long. Panicle branches glabrous, or pilose; glabrous in axils, or bearded in axils. Racemes 0.8-1.2 cm long; bearing few fertile spikelets; bearing (1-)2(-3) fertile spikelets on each. Rhachis fragile at the nodes; ciliate on margins. Rhachis internodes filiform; 3.6-4 mm long. Rhachis internode tip oblique; cupuliform. Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; ciliate.
    Spikelets
    Companion sterile spikelets well-developed; comprising 2 unequal glumes without lemmas; linear; 4.3-5 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; 6-8 -veined; pubescent; muticous. Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblanceolate; dorsally compressed; 5.3-6.6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus 0.2-0.3 mm long; bearded; base obtuse. Spikelet callus hairs white; 0.25 length of spikelet.
    Sterile
    Companion sterile spikelets well-developed; comprising 2 unequal glumes without lemmas; linear; 4.3-5 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes chartaceous; 6-8 -veined; pubescent; muticous.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblanceolate; dorsally compressed; 5.3-6.6 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus 0.2-0.3 mm long; bearded; base obtuse. Spikelet callus hairs white; 0.25 length of spikelet.
    Glume
    Glumes dissimilar; with lower wider than upper; exceeding apex of florets; firmer than fertile lemma. Lower glume ovate; 1 length of spikelet; coriaceous; dark brown, or black; without keels; keel-less except near apex; 11 -veined. Lower glume surface villous; inner surface glabrous. Lower glume hairs white. Lower glume apex acute. Upper glume ovate; coriaceous; dark brown, or black; without keels; 7 -veined. Upper glume surface villous. Upper glume hairs white.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 0.8 length of spikelet; hyaline; 2 -veined; ciliolate on margins. Fertile lemma oblong; 3-4 mm long; hyaline; 3 -veined. Lemma margins ciliate. Lemma apex dentate; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 2.5-4.3 mm long overall; with twisted column. Column of lemma awn pubescent; hairy on the spiral. Palea absent or minute.
    Flowers
    Lodicules 2; ciliate. Anthers 3; 1-1.3 mm long.
    Fruits
    Caryopsis with adherent pericarp; ellipsoid, or obovoid; 3 mm long.
    Distribution
    Asia-tropical: Malesia and Papuasia. Australasia: Australia.
    Reference
    Andropogoneae. Lazarides.

    Images

    Distribution

    Native to:

    Lesser Sunda Is., New Guinea, Northern Territory, Philippines, Queensland, Sulawesi, Western Australia

    Sorghum laxiflorum F.M.Bailey appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Jun 1, 2000 Bailey, F.M. [s.n.], Queensland K000898781 isotype
    Jun 1, 2000 Bailey, F.M. [s.n.], Queensland K000898782 isotype
    Jun 1, 2000 Bailey, F.M. [s.n.], Queensland K000898783 isotype

    First published in Bellenden-Ker Exped.: 70 (1889)

    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.
    • Henty, E.E. (1969). A manual of the grasses of New Guinea: 1-215. Division of Botany, Dpt. of Forests, LAE, New Guinea.

    Literature

    Kew Backbone Distributions
    • Wiec ?aw, H. (2014). Carex flava agg. (section Ceratocystis, Cyperaceae) in Poland: taxonomy, morphological variation and soil conditions Biodiversity: Research and Conservation 33: 3-47.
    • Henty, E.E. (1969). A manual of the grasses of New Guinea: 1-215. Division of Botany, Dpt. of Forests, LAE, New Guinea.

    Sources

    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 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