| Noun | 1. | Castanospermum - a rosid dicot genus of the subfamily Papilionoideae having one species: Moreton Bay chestnut rosid dicot genus - a genus of dicotyledonous plants Papilionoideae, subfamily Papilionoideae - alternative name used in some classification systems for the family Papilionaceae Australian chestnut, Moreton Bay chestnut - Australian tree having pinnate leaves and orange-yellow flowers followed by large woody pods containing 3 or 4 seeds that resemble chestnuts; yields dark strong wood |