Over 1,000 herbarium specimens including 24 type specimens were examined in an attempt to achieve a clearer understanding of the Phlox longifolia complex. Four variables were measured for each specimen and the data were statistically analyzed by discriminant analysis. Using a previously published system of classification for the complex, approximately 73 percent of the measured variation among the specimens was accounted for by that system. The clustering patterns produced in this first analysis indicated that a more conservative approach would be advisable. The formulation and subsequent application of a modified system produced a grouping of specimens that accounted for 95 percent of the measured variation for the four morphological characters considered. From four species and seven subspecies previously recognized, one species with five varieties is proposed. The typification of Phlox longifolia Nutt. and other related taxa is resolved.
Peabody, Frederick J.
"Phlox longifolia Nutt. (Polemoniaceae) complex of North America,"
Great Basin Naturalist: Vol. 39
, Article 1.
Available at: http://scholarsarchive.byu.edu/gbn/vol39/iss1/1