1. Family: Poaceae Barnhart
    1. Zea L.

      1. This genus is accepted, and its native range is Mexico to Nicaragua.

    [GB]

    nonem

    Habit
    Annual (4), or perennial (2). Rhizomes absent (4), or short (1), or elongated (1). Culms erect; robust (1/2), or of moderate stature (1/2); 100-245.8-500 cm long; with prop roots (3/3). Lateral branches lacking (1/1). Ligule an eciliate membrane. Leaf-blades linear (4), or lanceolate.
    Inflorescences
    Monoecious. Inflorescence composed of racemes; axillary; subtended by a spatheole; enclosed. Spatheole elliptic; herbaceous. Racemes single; bilateral (5), or multilateral (1); bearing 4 fertile spikelets on each (1/2), or 5-10 fertile spikelets on each (2/2). Rhachis tough (1), or fragile at the nodes (5); subcylindrical and excavated (5), or enlarged into a woody cob (1). Spikelet packing crowded (1), or contiguous (5); 2 -rowed (2/3), or 4-11 -rowed (1/3). Rhachis internodes indefinite (1), or inflated (5). Rhachis internode tip oblique (5/5); flat (3/5), or cupuliform (2/5). Spikelets sunken; solitary (5), or in pairs (1). Fertile spikelets sessile; 2 in the cluster (1/1). Male spikelets sessile (1/5), or sessile and pedicelled (5/5); 2 in a cluster (5/5). Male inflorescence terminal; unlike female; of subdigitate racemes (2), or of racemes along a central axis. Male spikelets distinct from female; elliptic (5/5). Male spikelet glumes 2; muticous. Male spikelet lemma muticous.
    Spikelets
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (4), or obovate (1), or rhomboid (1); laterally compressed (5), or dorsally compressed (1); 4-5.333-8 mm long; persistent on plant (1), or falling entire (5); deciduous with accessory branch structures (5/5).
    Fertile
    Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong (4), or obovate (1), or rhomboid (1); laterally compressed (5), or dorsally compressed (1); 4-5.333-8 mm long; persistent on plant (1), or falling entire (5); deciduous with accessory branch structures (5/5).
    Glume
    Glumes reaching apex of florets; firmer than fertile lemma. Lower glume oblong (5), or oblate (1); scarious (1), or coriaceous (2), or indurate (3); without keels; 0 -veined (1/1). Lower glume lateral veins absent (1), or distinct (5). Upper glume elliptic (5), or oblate (1); membranous (5), or scarious (1); without keels; 0 -veined (1/1).
    Florets
    Basal sterile florets barren; with palea, or without significant palea. Lemma of lower sterile floret ovate (1/1); membranous; 0 -veined (1/1). Fertile florets female. Fertile lemma elliptic (5), or orbicular (1); hyaline (5), or membranous (1); without keel; 0 -veined (1/1).
    Flowers
    Lodicules absent (1/1), or 2 (1/1). Anthers 3. Stigmas 2; papillose.
    Fruits
    Caryopsis with adherent pericarp.
    Male
    Male inflorescence terminal; unlike female; of subdigitate racemes (2), or of racemes along a central axis. Male spikelets distinct from female; elliptic (5/5). Male spikelet glumes 2; muticous. Male spikelet lemma muticous.
    Distribution
    Europe (1), or Africa (3), or Temperate Asia (2), or Tropical Asia (2), or Australasia (2), or Pacific (1), or North America (4), or South America (3).

    Images

    Distribution

    Native to:

    Guatemala, Honduras, Mexico Central, Mexico Northeast, Mexico Southeast, Mexico Southwest, Nicaragua

    Introduced into:

    Afghanistan, Alabama, Albania, Aldabra, Algeria, Amur, Andaman Is., Angola, Argentina Northeast, Arizona, Arkansas, Aruba, Assam, Austria, Azores, Bahamas, Baleares, Baltic States, Bangladesh, Belarus, Belgium, Belize, Benin, Bismarck Archipelago, Bolivia, Borneo, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Bulgaria, Burkina, Burundi, California, Cambodia, Cameroon, Canary Is., Caroline Is., Cayman Is., Central African Repu, Central European Rus, Chad, Chagos Archipelago, China North-Central, China South-Central, China Southeast, Christmas I., Colombia, Colorado, Comoros, Connecticut, Corse, Costa Rica, Cuba, Cyprus, Czechoslovakia, Djibouti, Dominican Republic, East European Russia, East Himalaya, Ecuador, Egypt, Equatorial Guinea, Ethiopia, Fiji, Florida, France, French Guiana, Galápagos, Gambia, Georgia, Germany, Ghana, Great Britain, Greece, Guinea, Guinea-Bissau, Gulf of Guinea Is., Hainan, Haiti, Hawaii, Hungary, Idaho, Illinois, India, Indiana, Iowa, Iraq, Ireland, Italy, Ivory Coast, Jamaica, Japan, Jawa, Kansas, Kazakhstan, Kentucky, Khabarovsk, Kirgizstan, Korea, Kriti, Krym, Laos, Leeward Is., Lesser Sunda Is., Louisiana, Madagascar, Maine, Malaya, Mali, Maluku, Manchuria, Marianas, Marshall Is., Maryland, Masachusettes, Mauritius, Mexico Gulf, Mexico Northwest, Minnesota, Mississippi, Missouri, Montana, Morocco, Mozambique, Myanmar, Nansei-shoto, Nebraska, Nepal, Netherlands, Netherlands Antilles, Nevada, New Caledonia, New Guinea, New Hampshire, New Jersey, New Mexico, New York, Niger, Nigeria, Niue, North Carolina, North Caucasus, Northern Provinces, Northwest European R, Ohio, Oman, Ontario, Oregon, Pakistan, Panamá, Pennsylvania, Peru, Philippines, Pitcairn Is., Poland, Portugal, Primorye, Puerto Rico, Queensland, Québec, Rhode I., Rodrigues, Romania, Rwanda, Réunion, Sakhalin, Samoa, Sardegna, Seychelles, Sicilia, Sierra Leone, Somalia, South Carolina, South European Russi, Spain, Sri Lanka, Sudan, Switzerland, Tadzhikistan, Tanzania, Tennessee, Texas, Thailand, Togo, Transcaucasus, Trinidad-Tobago, Tunisia, Turkey, Turkey-in-Europe, Turkmenistan, Ukraine, Uruguay, Utah, Uzbekistan, Vanuatu, Venezuelan Antilles, Vermont, Vietnam, Virginia, Wake I., Washington, West Himalaya, West Virginia, Western Australia, Windward Is., Wisconsin, Wyoming, Yemen, Yugoslavia, Zambia, Zaïre

    Zea L. appears in other Kew resources:

    First published in Sp. Pl.: 971 (1753)

    Accepted by

    • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Flora of West Tropical Africa
    • F.T.A. 9: 26 (1917).
    • Gen. Pl. ed. 5, 419 (1754)
    • Sp. Pl. 971 (1753)

    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 2018. 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 2018. 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