(Vol.10, 2007-12) A Field Study of Hybridization Between Berberis Swaseyi and B. Trifoliolata (Berberidaceae) in Hays County, Texas
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The widespread Berberis trifoliolata is sympatric with the narrowly restricted B. swaseyi in central Texas, where apparent intermediates occur. A detailed field study of sympatric populations in northern Hays Co. during 2004 to 2007 clarifies the morphological and phenological differences between the two species and shows that intermediates almost surely arose from hybridization. Limited evidence of introgression is also discussed.