Biosystematics of Lysimachia Section Seleucia (Primulaceae)

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Abstract
Information obtained from cytological investigations, analyses of local population samples and herbarium specimens, transplant studies, and hybridization experiments is presented and used to establish a classification ofLysimachia sectionSeleucia. Chromosome numbers, including first counts for six of the seven species in the section, are reported. The number 2n = 34 exists in all seven species. The basic chromosome number for the section isx = 17. Aneuploids are present inLysimachia ciliata (2n = 34, 92, 96, 100, 108, 112). Some plants ofL. tonsa are 2n= 34, others are hexaploid 2n = 102. Fertile hybrids have been obtained from crosses between all diploids and from crosses among aneuploids and between hexaploids. On the basis of this study, seven species are recognized in sectionSeleucia, i.e.,L. ciliata, L. graminea, L. hybrida, L. lanceolata, L. quadriflora, L. radicans, andL. tonsa. Keys, descriptions, synonymies, and distribution maps are provided. Seasonal isolation is documented betweenL. quadriflora andL. graminea. The seven species in sectionSeleucia are closely related and species integrity is apparently maintained through seasonal and ecological isolating mechanisms.

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