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

[GB]

nonem

Morphology General 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.
Morphology Reproductive morphology 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.
Morphology Reproductive morphology Inflorescences 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).
Morphology Reproductive morphology Inflorescences Bracts 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).
Morphology Reproductive morphology Flowers 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).
Morphology Reproductive morphology Flowers
Lodicules absent (1/1), or 2 (1/1). Anthers 3. Stigmas 2; papillose.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp.
sex 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).

[FSOM]

M. Thulin. Flora of Somalia, Vol. 1–4 [updated 2008] https://plants.jstor.org/collection/FLOS

Distribution
Four species in Central America.
Morphology General Habit
Robust broad-leaved monoecious annual (rarely perennial)
Morphology Reproductive morphology Inflorescences
Female inflorescence axillary, a single raceme wrapped in several spathes; internodes fused into a polystichous woody cob bearing paired sessile spikelets at each node; spikelets shallowly inserted in the surface of the cob, with short chaffy glumes exposing the grain; lower floret barren; style single, very long, silky, pendulous from the tip of the inflorescence Male inflorescence terminal, of digitate or paniculate racemes; internodes tough, narrow, bearing paired spikelets, one of them on a slender, free pedicel; both florets male.

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, Massachusetts, 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)

Flora of Somalia

  • Flora Somalia, Vol 4, (1995) Author: by T. A. Cope [updated by M. Thulin 2008]

Flora of Somalia
Flora of Somalia
http://creativecommons.org/licenses/by-nc-sa/3.0

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 2021. 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 2021. 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