Gari Ledyard | Carter Ledyard & Milburn | Lucy Ward Stebbins | Joel Stebbins | Henry G. Stebbins | Grant Ledyard | Alice Stebbins Wells |
The polyploid complex was first described by E. B. Babcock and G. Ledyard Stebbins in their 1938 monograph The American Species of Crepis: their interrelationships and distribution as affected by polyploidy and apomixis.
Taxomonic and cytogenetic studies by E. B. Babcock and G. Ledyard Stebbins led to the reclassification of the genus in the 1930s.