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Oryza Taxonomy

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Rice belongs to the genus Oryza, of the tribe Oryzeae, of the subfamily Bambusoideae or Ehrhartoideae, of the family Poaceae or Gramineae. The 2 cultivated species are Oryza sativa and Oryza glaberrima. As a result of genetic studies, many scientists believe that common wild rice, Oryza rufipogon, was the wild ancestor of Oryza sativa.

According to PlantsDB and ITIS there are 7 accepted species of rice:

Kingdom: Plantae - Plants
Subkingdom: Tracheobionta - Vascular plants
Superdivision: Spermatophyta - Seed plants
Division: Magnoliophyta - Flowering plants
Class: Liliopsida - Monocotyledons
Subclass: Commelinidae
Order: Cyperales
Family: Poaceae - Grass family
Genus: Oryza L. - rice
Species: Oryza barthii - Barth's rice
Species: Oryza glaberrima - African rice
Species: Oryza latifolia - broadleaf rice
Species: Oryza longistaminata - longstamen rice
Species: Oryza punctata - red rice
Species: Oryza rufipogon - brownbeard rice
Species: Oryza sativa - rice
Data from: Plants Database USDA, NRCS. 2006. The PLANTS Database (, 17 October 2006). National Plant Data Center, Baton Rouge, LA 70874-4490 USA, and ITIS Retrieved October 17, 2006.
However, these resources focus only on North America, and the research community identifies 23 species and 10 recognized genome types (AA, BB, CC, BBCC, CCDD, EE, FF, GG, HHJJ, HHKK [Gramene]).

At Gramene, where the genomic data is taken from publications, Oryza species with data include:

Oryza alta
Oryza australiensis
Oryza barthii
Oryza brachyantha
Oryza coarctata
Oryza eichingeri
Oryza glaberrima
Oryza glumipatula (Oryza glumaepatula)
Oryza grandiglumis
Oryza granulata
Oryza latifolia
Oryza longiglumis
Oryza logistaminata (Oryza glumaepatula)
Oryza malampuzhaensis
Oryza meridionalis
Oryza meyeriana
Oryza minuta
Oryza nivara (Oryza sativa f. spontanea)
Oryza officinalis
Oryza perennis
Oryza punctata
Oryza rhizomatis
Oryza ridleyi
Oryza rufipogon
Oryza sativa
Oryza schlecteri

Data retrieved October 17, 2006

Links to Oryza taxonomy information: