The adventive species of Crassulaceae.
The results of analysis of adventive species of the Crassulaceae family from different regions of the Earth are presented. The highest number of alien and naturalized species of Crassulaceae is found in Australia (approximately 50 species). Most of these species grow in New Zealand, North America, and Europe. There are known cases of wild Crassulaceae in Eastern Europe. The following species of Crassulaceae were identified in this region as adventive: Phedimus spurius, Ph. crenatus, Ph. stoloniferus, Sedum reflexum, S. forsterianum, S. lineare, S. sexangulare (wild in western regions of Eastern Europe and naturalized in Izhevsk and others), Hylotelephium erythrostictum, Aizopsis hybrida, A. kamtschatica, Sempervivum tectorum, and others. Data on naturalization of Sedum album L. and Hylotelephium spectabile appeared recently. Our studies showed that, at present, Sedum reflexum is most actively naturalized in Eastern Europe and the Caucasus. Most adventive Crassulaceae can be considered as neophytes or colonophytes (rarely ephemerophytes).