. The Canadian field-naturalist. Natural history; Sciences naturelles. 2006 ()HAM,(i(;() Blanly: Bur Buithrcup 321. Figure 2. Bur Buttercup {Ranunculus testiculaius) habitat at Long Point Provincial Park. Ontario, on 6 Ma\ 2004. Bur But- tercup plants appear as a light coloured area in front of the closest Scots Pine tree in the foreground. Photograph b> Michael Oldham. Literature Cited Barkworth, M. 1982. Bur buttercup: a weedy immigrant. Utah Science 43: 6-9. Boivin, B. 1966. Enumeration des plantes du Canada. Ill - Herbidees, l"' partie. Le Naturaliste canadien 93: 583-6
. The Canadian field-naturalist. Natural history; Sciences naturelles. 2006 ()HAM,(i(;() Blanly: Bur Buithrcup 321. Figure 2. Bur Buttercup {Ranunculus testiculaius) habitat at Long Point Provincial Park. Ontario, on 6 Ma\ 2004. Bur But- tercup plants appear as a light coloured area in front of the closest Scots Pine tree in the foreground. Photograph b> Michael Oldham. Literature Cited Barkworth, M. 1982. Bur buttercup: a weedy immigrant. Utah Science 43: 6-9. Boivin, B. 1966. Enumeration des plantes du Canada. Ill - Herbidees, l"' partie. Le Naturaliste canadien 93: 583-646. Cody, 1988. Homseed Buttercup. Ceratocephalus tes- ticulaius: a new record for the adventive flora of Saskat- chewan. Canadian Field-Naturalist 102: 71-73. Grins, W. J., D. A. Sutherland, and M. J. Oldham. 1987. Veronica verna (Scrophulariaceae). an overlooked element of the naturalized flora of Ontario. Michigan Botanist 26: 161-165. Cusick, A. W. 1989. Bur buttercup (Ceratocephalus testic- ulaius: Ranunculaceae): a poisonous plant newly estab- lished in Ohio. Michigan Botanist 28: 33-35. Douglas, G. W., D. Meidinger and J. Pojar, Editors. 1999. Illustrated Flora of British Columbia. Volume 4. Dico- tyledons (Orobanchaceae through Rubiaceae). British Columbia Ministry of Environment. Lands and Parks. Victoria, British Columbia. 427 pages. Gleason, H. A., and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Cana- da. Second Edition. New York Botanical Garden. Bronx. New York. Ixxv -i- 910 pages. Goltz, J. 1996. Campground companions: rare plants at your tent flap. New Brunswick Naturalist 23: 70-71. Hitchcock, C. L., and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press, Seattle. Kartesz, J. T. 1999. A synonymized checklist and atlas with biological attributes for the vascular flora of the United States. Canada, and Greenland. First edition. In Synthe- sis of the North American Flora. Version
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