Dandya purpusii is a species of flowering plant endemic to northeastern Mexico. It is the only species in the genus Dandya. In the APG III classification system, it is placed in the asparagus family Asparagaceae, and the cluster lily subfamily Brodiaeoideae (formerly the family Themidaceae).Espejo Serena, A. & López-Ferrari, A.R. (1993). Las Monocotiledóneas Mexicanas una Sinopsis Florística 1(1): 1-76. Consejo Nacional de la Flora de México, México D.F. The genus is named in honor of James Edgar Dandy.
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