1. Family: Poaceae Barnhart
    1. Genus: Zea L.
      1. Zea perennis (Hitchc.) Reeves & Mangelsd.

        This species is accepted, and its native range is Mexico (SE. Jalisco).

    [GB]
    Habit
    Perennial. Rhizomes elongated (internodes 1-6cm); scaly. Culms erect; of moderate stature; 100-200 cm long. Culm-internodes solid. Leaves cauline. Leaf-sheaths reticulately veined. Ligule an eciliate membrane; 1-2 mm long. Leaf-blade base cordate. Leaf-blades linear, or lanceolate; 20-40 cm long; 10-30 mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.
    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; 3-6 cm long. Rhachis fragile at the nodes; subcylindrical and excavated. Rhachis internodes inflated; 6-8 mm long. Rhachis internode tip oblique; flat. Spikelets sunken; solitary. Fertile spikelets sessile. Male spikelets sessile and pedicelled; 2 in a cluster. Pedicels (male) 3-4 mm long. Male inflorescence terminal; unlike female; of subdigitate racemes, or of racemes along a central axis. Male spikelets distinct from female; with free pedicels; 2 flowered; elliptic; 8-9 mm long. Male spikelet glumes 2; winged; muticous. Male spikelet lemma muticous.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong; laterally compressed; 4-6 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; 4-6 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 subdigitate racemes, or of racemes along a central axis. Male spikelets distinct from female; with free pedicels; 2 flowered; elliptic; 8-9 mm long. Male spikelet glumes 2; winged; muticous. Male spikelet lemma muticous.
    Distribution
    Africa: south. North America: Mexico.
    Reference
    Andropogoneae. Hitchcock 1993.
    Diagnostic
    Female internodes trapezoidal; male lower glume flat.

    Distribution

    Native to:

    Mexico Southwest

    Introduced into:

    Mexico Central, Northern Provinces, South Carolina

    Zea perennis (Hitchc.) Reeves & Mangelsd. appears in other Kew resources:

    First published in Amer. J. Bot. 29: 817 (1942)

    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.
    • 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.

    Literature

    Kew Backbone Distributions
    • 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.

    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