Inside the genus
Oryza, species can be divided by their genomes types (listed after each species name below). They include the
diploid (2n = 24) of cultivated rice and
their relatives, , , , and as well as the
tetraploid (4n = 48) , , , and . Species of the same genome type cross easily, while hybridizing different types requires techniques like
embryo rescue. Over 300 names have been proposed for species, subspecies, and other infraspecific taxa within the genus. Published sources disagree as to how many of these should be recognized as distinct species. The following follows the World Checklist maintained by Kew Garden in London. •
Oryza australiensis (EE) – Australia •
Oryza barthii (AA) – tropical Africa •
Oryza brachyantha (FF) – tropical Africa •
Oryza coarctata (KKLL) – India, Pakistan, Bangladesh, Myanmar •
Oryza eichingeri (CC) – tropical Africa, Sri Lanka •
Oryza glaberrima (AA) – African rice – tropical Africa •
Oryza grandiglumis (CCDD) – Brazil, Venezuela, Fr Guiana, Colombia, Peru, Bolivia •
Oryza latifolia (CCDD) – Latin America + West Indies from Sinaloa + Cuba to Argentina •
Oryza longiglumis (HHJJ) – New Guinea •
Oryza longistaminata (AA) – Madagascar, tropical + southern Africa •
Oryza meyeriana (GG) – China, Indian Subcontinent, Southeast Asia •
Oryza minuta (BBCC) – Himalayas, Southeast Asia, New Guinea, Northern Territory of Australia •
Oryza neocaledonica (GG) – New Caledonia •
Oryza officinalis (CC) – China, Indian Subcontinent, Southeast Asia, New Guinea, Australia •
Oryza punctata (BB) – Madagascar, tropical + southern Africa •
Oryza ridleyi (HHJJ) – Southeast Asia, New Guinea •
Oryza rufipogon (AA) – brownbeard or red rice – China, Indian Subcontinent, Southeast Asia, New Guinea, Australia •
Oryza sativa (AA) – Asian rice – China, Indian Subcontinent, Japan, Southeast Asia; naturalized many places •
Oryza schlechteri (HHKK) – New Guinea
Formerly included Many species are now regarded as better suited to other genera: •
Echinochloa •
Leersia •
Maltebrunia •
Potamophila •
Prosphytochloa •
Rhynchoryza ==See also==