We used horizontal starch gel-electrophoresis to observe isozyme phenotypes of narra (Pterocarpus indicus Willd.) at 6 polymorphic enzyme systems. An inheritance study was based on the observation of segregation within single tree progeny arrays of putatively heterozygous seed trees. Only primary leaves of young seedlings, but no material of the seed trees were available for investigation. We were able to test hypotheses on the genetic control of observed variation patterns at five enzyme systems (IDH, MNR, SKDH, MDH, PGM), but failed to explain the complicated polymorphic patterns observed at 6-PGDH.