The mapping population consists of 312 doubled-haploid lines derived from the BC₃F₁ of an interspecific cross between Caiapo (Oryza sativa) x IRGC103544 (Oryza glaberrima). Caiapo, an indica commercial rice variety developed by the Brazilian national rice program for upland acid soil conditions was used as the recurrent parent. This variety is characterized by good milling and eating characteristics, a long grain type (9-10 mm), early maturity (110-120 days), low tiller number (4-8), a 80-cm height, and typical yields of 2.5 t/ha under upland conditions. Oryza glaberrima, IRGC 103544, originally collected in the wild from Mali, Africa, grows to a height of approximately 95 cm and shows resistance to several biotic and abiotic stresses. A linkage map was constructed with 100 polymorphic microsatellite markers using the MAPDISTO software program to adjust for segregation distortion. The marker and map data for this population are kindly provided by Dr. J. H. Oard.