Study taxa and voucher information.

Abbreviations listed are used in some supplemental figures and tables. The species designations used by Swingle and Tanaka are shown (Tanaka names omitted where they are the same as the Swingle name to the left). CRC# number refers to identification number of accessions maintained at the Citrus Variety Collection, Riverside, California. Asterisk (*) indicates accessions with about 10% or higher level of admixture of different groups of citrus as analyzed in the present study utilizing SSR markers (Table S6).