Featured: Lysimachia arvensis Image from Stuppy & Kesseler
©Papadakis Publisher

  1. Family: Poaceae Barnhart
    1. Genus: Agenium Nees

      1. Agenium majus Pilg.

        This species is accepted, and its native range is W. Central Brazil to Paraguay.

    [GB]
    Habit
    Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms erect; 100-120 cm long. Culm-nodes bearded. Ligule an eciliate membrane; 3 mm long. Leaf-blades convolute; 15-30 cm long; 3-6 mm wide; stiff. Leaf-blade apex attenuate.
    Inflorescences
    Inflorescence composed of racemes; terminal and axillary. Racemes 3-6; digitate; drooping; 5 cm long. Central inflorescence axis 1-2 cm long. Rhachis fragile at the nodes; flattened; ciliate on margins. Rhachis internodes linear; 4 mm long. Rhachis internode tip oblique; flat. Raceme-bases linear; 5-10 mm long. Spikelets in pairs. Fertile spikelets sessile; 1 in the cluster. Companion sterile spikelets pedicelled; 1 in the cluster. Pedicels filiform; flattened; 4-5 mm long; ciliate.
    Spikelets
    Basal sterile spikelets well-developed; 18 in number; male; lanceolate; 12 mm long; larger than fertile. Basal sterile spikelet glumes chartaceous. Companion sterile spikelets well-developed; male; lanceolate; laterally compressed; 12 mm long; longer than fertile; separately deciduous. Companion sterile spikelet callus square; 0.5 mm long; obtuse. Companion sterile spikelet glumes chartaceous; distinctly veined; 18 -veined; acute. Companion sterile spikelet lemmas 2; enclosed by glumes. Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus linear; 1-1.5 mm long; bearded; base pungent; attached obliquely.
    Sterile
    Basal sterile spikelets well-developed; 18 in number; male; lanceolate; 12 mm long; larger than fertile. Basal sterile spikelet glumes chartaceous. Companion sterile spikelets well-developed; male; lanceolate; laterally compressed; 12 mm long; longer than fertile; separately deciduous. Companion sterile spikelet callus square; 0.5 mm long; obtuse. Companion sterile spikelet glumes chartaceous; distinctly veined; 18 -veined; acute. Companion sterile spikelet lemmas 2; enclosed by glumes.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6.5 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus linear; 1-1.5 mm long; bearded; base pungent; attached obliquely.
    Glume
    Glumes dissimilar; exceeding apex of florets; firmer than fertile lemma. Lower glume lanceolate; 6.5 mm long; 1 length of spikelet; coriaceous; without keels; 8 -veined. Lower glume surface with a longitudinal median groove; pubescent; hairy above. Lower glume apex obtuse. Upper glume lanceolate; coriaceous; without keels. Upper glume apex obtuse.
    Florets
    Basal sterile florets barren; without significant palea. Lemma of lower sterile floret elliptic; 3 mm long; hyaline; truncate. Fertile lemma linear; 2 mm long; cartilaginous; without keel; 1 -veined. Lemma apex entire; acute; awned; 1 -awned. Principal lemma awn geniculate; 60 mm long overall; with twisted column. Column of lemma awn pubescent. Palea absent or minute.
    Fruits
    Disseminule comprising a spikelet.
    Distribution
    South America: Brazil and southern South America.
    Reference
    Andropogoneae. WDC.

    Images

    Distribution

    Native to:

    Brazil West-Central, Paraguay

    Agenium majus Pilg. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Hassler, E. [11386a], Paraguay K000632823
    Hassler, E. [11386], Paraguay K000632824
    Balansa [223], Paraguay K000632822

    First published in Repert. Spec. Nov. Regni Veg. 43: 82 (1938)

    Accepted by

    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.
    • 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
    • Forzza, R.C. & al. (2013). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
    • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348.

    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 2020. 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 2020. 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