Cytogeography of Solidago sect. Erectae, sect. Villosicarpae, sect. Squarrosae, and sect. Brintonia (Asteraceae: Astereae)

Chromosome numbers are reported for 67 individuals of 13 species of Solidago sect. Erectae, S. sect. Squarrosae, and S. sect. Villosicarpae from 65 locations in eastern Canada and the eastern United States: S. bicolor, S. erecta, S. hispida, S. jejunifolia, S. pallida, S. puberula, S. pulverulenta, S. rigidiuscula, S. roanensis, S. sciaphila, S. speciosa, S. squarrosa, and S. villosicarpa. Cytogeography maps based on new reports and all 258 previously published reports from 230 locations for the three sections plus S. sect. Brintonia (S. discoidea) are presented for 20 of the 30 species in the four closely related sections. The following are either first documented reports for the taxon or just first counts for a taxon from particular provinces and states: Solidago bicolor, 2n = 18 from Nova Scotia and Prince Edward Island; S. hispida var. hispida, 2n = 18 from New Hampshire, New Brunswick, and Wisconsin; S. jejunifolia, 2n = 18 from Michigan and Minnesota; S. pallida, 2n = 18 from Wyoming; S. puberula, 2n = 18 from Pennsylvania, Prince Edward Island, and Virginia; and first reports for S. sciaphila, 2n = 36 from Iowa, Illinois, and Wisconsin.