Distribution and Some Morphological Characters of Wild Rice in Madagascar

During the trip from August to September in 1985 in Madagascar, 13 strains of wild rice, i.e., Oryza longistaminata CHEV. et ROEHR., were collected and some populations of them were observed. Their localities and habitats were reported in detail. Locality names are as follows; Marovoay, Mahajanga, Antananarivo, Antsapanimahozo, Anororo, Ambatondrazaka, Imerimandroso, Antanifutsy. From the analyses of unhusked grain characters, average values in the whole strains were found to be 8.80mm±0.39, 2.42mm±0.12, 1.61mm±0.05, 3.65±0.20, 5.46±0.24 and 1.50±0.06 in length, width, thickness, ratios of length to width, of length to thickness, and of width to thickness, respectively. In the analyses of the data obtained in the field survey, morphological and genetical characters, ecotypic and varietal differentiations may be discussed in the future