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Oryza ridleyi Hook. f.

  • Distribution
    Distribution
  • Habitat
    Habitat
  • Habitat
    Habitat
  • Habitat
    Habitat
  • Plant
    Plant
  • Inflorescence
    Inflorescence

Explanations

Genome designation
HHJJ
Chromosome number
Tetraploid, 2n=48
Distribution
Cambodia, Indonesia, Laos, Malaysia, Myanmar, Papua New Guinea, Thailand
Key characteristics
Flexuous sterile lemma distinctly shorter than spikelet., Spikelet 7-8mm long and 1.8-2.2mm wide with trichomes in rows down its length. Palea and lemma papery. Awn about 1cm. 1-2m tall. Stolons well developed.
Habitat
Always in shade or semi shade of primary or well developed secondary forest. Found in swamps or close to large rivers that seasonally inundate the forest floor sometimes to considerable depth.
Potentially useful traits
Stemborer resistance recorded.
Notes
This species is quite common in flooded forests often beside large rivers. In some area such as the Sepik River and around the Chambri Lakes of Papua New Guinea populations are highly sterile and affected by insect pests.
References
Duistermaat, H. 1987. A revision of Oryza (Graminae) in Malaysia and Australia. Blumea 32: 157-193
Naredo, M.E.B., A.B. Juliano, B.R. Lu and M.T. Jackson. 2003. The taxonomic status of the wild rice species Oryza ridleyi Hook. f. and O. longiglumis Jansen (Ser. Ridleyanae Sharma and Shastry) from Southeast Asia. Crop Genetic Resources and Evolution 50: 477-488
Tateoka, T. 1962. Taxonomic studies of Oryza II. Several species complexes. Bot. Mag. Tokyo. 75:455-461