Eremurus inderiensis (M. Bieb) Regel and E. anisopterus (Kar. et Kir) Regel are herbaceous perennial spring ephemeral of Liliaceae, and in China they only distribute in Gurbantunggut Desert of Xinjiang. There are discernible differences between two sympatric Eremurus species in floral characters. In this study, we had chosen the location where two Eremurus species distributed sympatric to focus on the questions as follow: (1) the reproductive isolation mechanism between them; (2) the evolutionary imp...