Species of Aquilegia are polymorphic and difficult to define adequately. Some of the variability is because of introgressive hybridization. Even distantly related species of columbine are often freely interfertile, and many cases of natural hybridization and introgression are known from North America. In arid areas Aquilegia species tend to form small populations often completely isolated from one another - this leads to local fixation of genes and therefore increased variability in species such as Aquilegia. micrantha and Aquilegia. desertorum . In addition, populations with spurless petals are occasionally found in many species[
Aquilegia akitensis Huth
Aquilegia buergeriana pumila Huth
Aquilegia fauriei H.Lév.
Aquilegia glandulosa Miq.
Aquilegia japonica Nakai & Hara
Aquilegia sibirica flabellata Finet & Gagnep.
Aquilegia sibirica japonica Rapaics
Aquilegia sibirica spectabilis Baker
Aquilegia spectabilis Lem.
Aquilegia vulgaris Thunb.
Common Name: Fan Columbine
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