Generic limits in the Pyroloideae (Ericaceae)

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Abstract
A reevaluation of the generic limits within the Pyroloideae is presented, taking into consideration the more recent evidence of chromosome number within the group. Chromosome number is correlated with more obvious morphological features, many of which have been the prime basis for the delimitation of generic boundaries in earlier treatments. Brief consideration is given also to the implications of data obtained from a thin-layer chromatographic analysis of the subfamily.Three generic segregates from within the original broad concept of the genus Pyrola are recognized. The diploid chromosome numbers which have been reported for Orthilia secunda (L.) House (2n = 38) and Moneses uniflora (L.) Gray and Chimaphila spp. (2n = 26) in conjunction with discrete differences in inflorescence types and floral modifications among these taxa serve as useful characteristics on which to base their recognition as genera distinct from Pyrola s.str. (2n = 46).

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