Intra-and Interspecific Allelochemical Effects in Three Kalanchoe-Species (Crassulaceae)

The intra-and interspecific acting allelochemicals of Kalanchoe daigremontiana, K. tubiflora and K. pinnata (Crassulaceae) were isolated and could be identified as p-hydroxybenzoic-, protocatechuic-, gallic-, p-coumaric-and coffeic acid. By measuring length of stems and primary roots of Kalanchoe-daughter plants the intra-and interspecific inhibitory activities of authentic compounds could be demonstrated.