Verbatim text: Semple, J. C. 1982. Observations on morphology and cytology of Aster hemisphaericus, A. paludosus, and A. chapmanii (Asteraceae) with comments on chromosomal base number and phylogeny of Aster subg. Aster sect. Heleastrum. Syst. Bot. 7: 60–70.
Author: Semple, J.C.
Year: 1982
Title: Observations on morphology and cytology of Aster hemisphaericus, A. paludosus, and A. chapmanii (Asteraceae) with comments on chromosomal base number and phylogeny of Aster subg. Aster sect. Heleastrum
Journal: Syst. Bot
Volume: 7
Pages: 60–70