Interspecific Hybridization in Eastern North American Heuchera (Saxifragaceae)

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Abstract
An artificial hybridization program was conducted utilizing eastern species of Heuchera to determine whether genetic barriers could be detected between any of the species and, if so, to observe whether they could be correlated with the existing taxonomic treatment of the genus. Genetic barriers, although incomplete, can be detected among certain of the eastern species in the form of unilateral incompatibility, low pollen viability, reduced seed set and reduced seed germination percentages. These genetic barriers do not correspond to the existing treatment of Heuchera, but support taxonomic changes at the sectional and subsectional levels.