1. Family: Poaceae Barnhart
    1. Genus: Zea L.
      1. Zea mexicana (Schrad.) Kuntze

        This species is accepted, and its native range is Mexico (Chihuahua to N. Oaxaca).

    [GB]
    Habit
    Annual. Culms erect; 200-400 cm long; with prop roots. Culm-internodes solid. Leaves cauline. Ligule an eciliate membrane. Leaf-blades linear, or lanceolate; 60-120 cm long; 50-80 mm wide.
    Inflorescences
    Monoecious; with male and female spikelets in different inflorescences. Inflorescence composed of racemes; axillary; subtended by a spatheole; enclosed. Spatheole elliptic; herbaceous. Racemes 1; single; bilateral. Rhachis fragile at the nodes; subcylindrical and excavated. Rhachis internodes inflated; 6-10 mm long. Rhachis internode tip oblique; flat. Spikelets sunken; solitary. Fertile spikelets sessile. Male spikelets sessile and pedicelled; 2 in a cluster. Male inflorescence terminal; unlike female; of racemes along a central axis. Male spikelets distinct from female; with free pedicels; 2 flowered; elliptic; 7.5-10.5 mm long. Male spikelet glumes 2; wingless; muticous. Male spikelet lemma muticous.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4-8 mm long; falling entire; deciduous with accessory branch structures.
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4-8 mm long; falling entire; deciduous with accessory branch structures.
    Glume
    Glumes dissimilar; reaching apex of florets; firmer than fertile lemma. Lower glume oblong; 1 length of spikelet; indurate; without keels. Upper glume elliptic; membranous; without keels.
    Florets
    Basal sterile florets barren; with palea, or without significant palea. Lemma of lower sterile floret membranous. Fertile florets female. Fertile lemma elliptic; hyaline; without keel.
    Flowers
    Anthers 3. Stigmas 2; terminally exserted; papillose. Styles connate below.
    Fruits
    Caryopsis with adherent pericarp.
    Male
    Male inflorescence terminal; unlike female; of racemes along a central axis. Male spikelets distinct from female; with free pedicels; 2 flowered; elliptic; 7.5-10.5 mm long. Male spikelet glumes 2; wingless; muticous. Male spikelet lemma muticous.
    Distribution
    Africa: north. Asia-temperate: eastern Asia. Asia-tropical: Malesia. Australasia: Australia. North America: southwest USA, south-central USA, southeast USA, and Mexico.
    Reference
    Andropogoneae. WDC.
    Diagnostic
    Female internodes triangular; male lower glume convex.

    Images

    Distribution

    Native to:

    Mexico Central, Mexico Northeast, Mexico Southwest

    Introduced into:

    Alabama, Brazil West-Central, Egypt, Florida, Jawa, Maryland, Philippines, Queensland, Sri Lanka

    Zea mexicana (Schrad.) Kuntze appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Pringle, C.G. [4319], Mexico K000478111
    Palmer, E. [743], Mexico K000478112
    Iltis, H.H [401], Mexico K000518033
    Hinton, G.B. [1758], México State Zea mays subsp. mexicana K000476402

    First published in T.E.von Post & C.E.O.Kuntze, Lex. Gen. Phan.: 599 (1904)

    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.
    • Boulos, L. (2005). Flora of Egypt 4: 1-617. Al Hadara Publishing, Cairo.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.
    • Dassanayake (ed.) (1994). A Revised Handbook to the Flora of Ceylon 8: 1-458. Oxford & IBH Publishing Co. PVT. LTD., New Delhi, Calcutta.

    Literature

    Kew Backbone Distributions
    • Forzza, R.C. & al. (2013). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
    • Sumadijaya, A. (2011). An account of the non-bambusoid alien grasses (Poaceae) in Java, one century after first records by Backer Folia Malaysiana 12: 47-68.
    • Dávila, P., Mejia-Saulés, M.T., Gómez-Sánchez, N., Valdés-Reyna, J., Ortíz, J.J., Morín, C., Castrejón, J. & Ocampo, A. (2006). Catálogo de las Gramíneas de México: 1-671. CONABIO, México city.
    • Flora of North America Editorial Committee (2003). Flora of North America North of Mexico 25: 1-781. Oxford University Press, New York, Oxford.
    • Dassanayake (ed.) (1994). A Revised Handbook to the Flora of Ceylon 8: 1-458. Oxford & IBH Publishing Co. PVT. LTD., New Delhi, Calcutta.

    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