Background
Hybridization has been shown to play a critical role in the evolution of plants (Rieseberg and Wendel 1993) and molecular studies have allowed scientists to re-evaluate taxonomy through multiple methods besides just morphological characteristics (Li et al. 2012). However, some ferns, such as the cheilanthoid ferns in the family Pteridaceae, had not been re-classified as of 2012 even though they were known to be non-monophyletic (that they didn’t all share a single common ancestor). Li et al. (2012) were particularly interested in a group of about twenty cheilanthoid ferns referred to as the “Cheilanthes marginata group,” which are found in arid habitats ranging from Arizona and Texas all the way to Bolivia. They hoped to distinguish this group from its most closely related fern relatives and revise the taxonomy based on the number of chromosomes (an organism’s condensed DNA) and genetic relatedness. Continue reading “Going gaga for ferns!”