Another important factor for geophyte evolution are adaptations to exploit expansive/contractive clay soils. The root destructive characteristics of these soils excludes competitors for geophytes with seasonal roots. Places with these clays can be "islands" of geophyte endemism, i.e. the "Willow soils" of Riverside Co. California. monica _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…