John C. Semple

Visit John C. Semple's web site on asters, goldenasters, and goldenrods: https://uwaterloo.ca/astereae-lab/.

The site summarizes five decades of research done by JCS, his graduate students, and a small army of enthusiastic undergraduate volunteers and senior honours project students at the University of Waterloo. Their work focused on the evolution and classification of Asters, Goldenasters and Goldenrods (Fam. Compositae) and phylogeny of the Tribe Astereae. Phytogeography, multivariate morphometrics, cytotaxonomy and chemosystematics used to resolve evolutionary histories. Cytogeography of polyploids.

• Rare plants of Ontario
• Asters
• Goldenrods
• Cytogenetics and cytogeography of the B Chromosomes of Xanthisma texanum

• 1972 Ph.D. Washington University, St. Louis, USA
• 1971 M.A. Washington University, St. Louis, USA
• 1969 B.Sc. cum laude, Tufts University

• Semple, J.C. and J.G. Chmielewski. 2022. Cytogeography of Solidago ser. Canadenses (Asteraceae: Astereae): S. brendae, S. canadensis, S. elongata, S. fallax, S. lepida, S. rupestris, S. shortii, and S. turneri. Phytoneuron 2022-57. 1-17.
• Morton, J.K., J. Venn and J.C. Semple. 2022. Chromosome number determinations in Solidago brendae, S. canadensis, S. fallax, and S. lepida (Asteraceae: Astereae). Rhodora 123: 345–352.
• Semple, J.C. and R.E. Cook. 2022. The cytogeography of Solidago sect. Erectae, sect. Villosicarpae, sect. Squarrosae, and sect. Brintonia (Asteraceae: Astereae). Taxonomy 2: 261–278.
• Semple, J.C., and J.G. Chmielewski. 2022. Cytogeography of Solidago sect. Multiradiatae (Asteraceae: Astereae). Ann. Missouri Bot. Gard. 107: 153–159.
• Semple, J.C. 2022. The cytogeography of Solidago altissima in North America (Asteraceae: Astereae). Phytoneuron. 2022-17: 1-14.
• Semple, J.C. and R.E. Cook. 2022. Cytogeography of Solidago sect. Maritimae (Asteraceae: Astereae). Ann. Mo. Bot. Garden 107: 21-31.