Iris pallida

Heinricher however, in cultivating some anomalous forms of _Iris pallida_, succeeded in filling out this gap and in producing [174] flowers with a uniform perianth and six stamens, recalling thereby the supposed ancestral type.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891

Though such instances cannot be considered as belonging strictly to the subject we are dealing with, I think it may be as well to give an example, especially as it affords an occasion for referring to the highly important researches of Heinricher on the variability and atavistic [173] tendencies of the pale blue flag or _Iris pallida_.

Species and Varieties, Their Origin by Mutation Hugo de Vries 1891