The Jepson Flora Project recently posted versions of the dichotomous keys from the 1993 Jepson Manual of California plants. See for example, http://ucjeps.berkeley.edu/interchange/I_treat_indexes.html http://ucjeps.berkeley.edu/cgi-bin/get_JM_treatment.pl?BRASSICACEAE http://ucjeps.berkeley.edu/cgi-bin/get_key.pl?ARABIS Richard Moe