1. Family: Poaceae Barnhart
    1. Genus: Sorghum Moench
      1. Sorghum exstans Lazarides

        This species is accepted, and its native range is N. Northern Territory.

    [GB]
    Habit
    Annual. Culms 130-300 cm long; 3-5.5 mm diam.; 5-8 -noded; with prop roots. Culm-internodes mid-green. Culm-nodes constricted, or flush with internodes; glabrous. Lateral branches lacking. Ligule an eciliate membrane; 2-4.5 mm long. Leaf-blades 6-12 mm wide. Leaf-blade surface glabrous, or pilose; with tubercle-based hairs.
    Inflorescences
    Inflorescence a panicle with branches tipped by a raceme. Panicle open; dense, or loose; 22-34 cm long; 3-5 cm wide. Primary panicle branches 1-14 -nate; simple; 4-7 cm long. Panicle axis smooth, or scaberulous. Panicle branches glabrous in axils; with prominent pulvini. Racemes 2-2.5 cm long; bearing a triad of spikelets; bearing 1 fertile spikelets on each. Rhachis obsolete. Spikelets in threes. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 2 in the cluster. Pedicels filiform; flattened; 6-8 mm long; ciliate; with dark brown hairs; with 3-3.2 mm long hairs.
    Spikelets
    Companion sterile spikelets well-developed; containing empty lemmas, or male; linear, or lanceolate; dorsally compressed; 10-14 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes cartilaginous; 7-9 -veined; glabrous to pilose; ciliate on margins; acuminate; muticous. Companion sterile spikelet lemmas enclosed by glumes. Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; dorsally compressed; 11-15.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; 3-8 mm long; base pungent.
    Sterile
    Companion sterile spikelets well-developed; containing empty lemmas, or male; linear, or lanceolate; dorsally compressed; 10-14 mm long; shorter than fertile; separately deciduous. Companion sterile spikelet glumes cartilaginous; 7-9 -veined; glabrous to pilose; ciliate on margins; acuminate; muticous. Companion sterile spikelet lemmas enclosed by glumes.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets obovate; dorsally compressed; 11-15.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus cuneate; 3-8 mm long; base pungent.
    Glume
    Glumes dissimilar; with lower wider than upper; exceeding apex of florets; firmer than fertile lemma; shiny. Lower glume ovate; 1 length of spikelet; cartilaginous, or coriaceous; much thinner above; 2-keeled; keeled above; winged on keel; winged narrowly; 7-9 -veined. Lower glume lateral veins with cross-veins. Lower glume surface glabrous, or pilose; with tubercle-based hairs. Lower glume hairs dark brown. Lower glume apex dentate; 3 -fid. Upper glume ovate; cartilaginous, or coriaceous; much thinner above; without keels; 5-7 -veined. Upper glume surface glabrous, or pilose.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret lanceolate; hyaline; 2 -veined; acute. Fertile lemma oblong; hyaline; 1 -veined. Lemma apex lobed; 2 -fid; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 70-110 mm long overall; with twisted column. Column of lemma awn glabrous. Palea absent or minute.
    Flowers
    Lodicules 2; oblong; 0.5-0.7 mm long; fleshy; ciliate; hairy on the corners. Anthers 3; 5-6.2 mm long. Stigmas 2. Ovary pubescent on apex.
    Fruits
    Caryopsis with adherent pericarp; obovoid; dorsally compressed; 4-6 mm long; hairy at apex.
    Distribution
    Australasia: Australia.
    Reference
    Andropogoneae. Lazarides 1993.

    Distribution

    Native to:

    Northern Territory

    Sorghum exstans Lazarides appears in other Kew resources:

    First published in Austral. Syst. Bot. 4: 613 (1991)

    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