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Semple, J. C., J. G. Chmielewski & C. Xiang. 1992. Chromosome number determinations in fam. Compositae, tribe Astereae. IV. Additional reports and comments on the cytogeography and status of some species of Aster and Solidago. Rhodora 94: 48–62.
Jones, A. G. 1980. Data on chromosome numbers in Aster (Asteraceae) with comments on the status and relationships of certain North American species. Brittonia 32(2): 240–261.