Analysis of the PCR amplicons of a SCAR marker LY2-1. 1, 2, 3, 4, 5, 6, 8, 9 and 14 are C. album samples collected from Sichuan Province. The samples LZ, GD, GX, HN, FJ were collected from Luzhou in Sichuan, Guangdong, Guangxi, Hainan and Fujian sources of D. longan varieties. DD is V. philippica. GJT is P. sedoides. GHC is P. Chinese collected from Gulin County in Sichuan Province. JYH is L. Japonica; TM is Gastrodia elata collected from Liangshan City in Sichuan Province. Lane “M” indicates the DNA molecular weight marker DL600 with the fragment size (bp) 600, 500, 400, 300, 200 and 100.