Cytogeography of Solidago subsect. Glomeruliflorae (Asteraceae: Astereae)

Abstract

Chromosome numbers were determined for 347 individuals of Solidago subsect. Glomeruliflorae (Torr. & A. Gray) Nesom, including 151 new reports. Previously unpublished documented reports are for the following taxa: Solidago caesia L. var. caesia R.E. Cook & Semple, S. caesia var. zedia R.E. Cook & Semple, Solidago curtisii Torr. & A. Gray var. curtisii (Small) R.E. Cook & Semple, S. curtisii var. flaccidifolia (Small) R.E. Cook & Semple, Solidago flexicaulis L., Solidago glomerata Michx., and Solidago lancifolia (Torr. & A. Gray) Chapm. All counts for S. caesia, Solidago macrophylla Pursh., and Solidago ouachitensis Taylor & Taylor were diploid (2n = 18). Two published counts for Solidago albopilosa E.L. Braun were tetraploid. Counts of 2n = 18 and 36 were made for S. flexicaulis. Counts of 2n = 18, 36, and 54 were made for S. curtisii. Counts of 2n = 108 and 126 were made for S. glomerata, and 2n = 90 for S. lancifolia. Cytogeographic maps of S. albopilosa , S. caesia var. caesia, S. curtisii var. curtisii, S. curtisii var. flaccidifolia, S. flexicaulis, S. glomerata, S. lancifolia, S. macrophylla, and S. ouachitensis were prepared including all counts. The following are first documented reports for the taxon: S. caesia var. zedia , 2n = 18, one population; S. lancifolia, 2n = 90, four populations.