Viola pedata L., the birdfoot violet, occasionally displays unusual variation in leaf shape in the southeastern United States. No satisfactory explanation for this has yet been provided. Analyses of variation in a colony with normal leaf shapes, one with the unusual leaf variants, and a neighboring population of Viola primulifolia L. subsp. villosa (Eaton) Russell leads to the hypothesis that the leaf variation is due to hybridization and subsequent introgression between V. pedata and V. primulifolia subsp. villosa.
Proceedings of the Iowa Academy of Science
©1960 Iowa Academy of Science, Inc.
Russell, Norman H. and Bowen, William R.
"A Hypothesis to Account for Unusual Leaf Variation in Viola pedata L.,"
Proceedings of the Iowa Academy of Science, 67(1), 189-194.
Available at: https://scholarworks.uni.edu/pias/vol67/iss1/26