. The Canadian field-naturalist. Natural history. Figures 21-24. Distributions of vascular plants in southern Ontario (based on herbarium specimens) in relation to lime-stone plains (shaded). 21. Euphorbia commutata. 22. Draba reptans. 23. Hymenoxys herbacea. 24. Carex scirpoidea. Acknowledgments J. Cayouette of Agriculture Canada's Centre for Land and Biological Resources Research provided useful comments on the manuscript. B. Eduards of the cartography unit of the Centre for Land and Biological Resources Research assisted with the plotting of maps using the Canada Soil Information System. Th
. The Canadian field-naturalist. Natural history. Figures 21-24. Distributions of vascular plants in southern Ontario (based on herbarium specimens) in relation to lime-stone plains (shaded). 21. Euphorbia commutata. 22. Draba reptans. 23. Hymenoxys herbacea. 24. Carex scirpoidea. Acknowledgments J. Cayouette of Agriculture Canada's Centre for Land and Biological Resources Research provided useful comments on the manuscript. B. Eduards of the cartography unit of the Centre for Land and Biological Resources Research assisted with the plotting of maps using the Canada Soil Information System. The maps were prepared for publication by M. Jomphe of the Centre for Land and Biological Resources Research. A. A. Reznicek provided records for some of the maps from specimens in the herbarium of the University of Michigan. Important records from the rare Ontario plant database of the Canadian Museum of Nature were made available by G. Argus. Literature Cited Argus, G. W., and K. M. Pryer. 1990. Rare vascular plants in Canada - our natural heritage. Canadian Museum of Namre. 191 pages + map. Belcher, J. W., and P. A. Keddy. 1992. Protecting alvar vegetation: will the sum of the parts equal the whole? Pages 327-331 in Science and management of protect- ed areas. The population structure of vegetation. Edited by J. H. M. Willison. S. Bondmp-Nielson. C. Drysdale. T. B. Herman, N. W. P. Munro and T. L. Pollock. Elsevir Science Publishers, Amsterdam. Belcher, J. W., P. A. Keddy, and P. M. Catling. 1992. Alvar vegetation in Canada: a multivariate description at two scales. Canadian Journal of Botany 70: 1279-1291. Bro\^Ti, D. M., G. A. McKay, and L. J. Chapman. 1980. The climate of southern Ontario. Environment Canada. Climatological Studies Number 5: 66 pages. Catling, P. M., and V. R. Catling. 1993. Floristic compo- sition, phytogeography and relationships of prairies, savannas and sand barrens along the Trent River, eastern Ontario. Canadian Field-Namrahst 107(1): 24-^5. Catling,
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