More on E. helleborine in Toronto
Rhodora is a quarterly publication of the Journal of the New England Botanical Club. The publication began in 1899, and the older issues are available online in full text through a digitization project called Botanicus, which is "a freely accessible, Web-based encyclopedia of digitized 18th and 19th century botanical literature from the Missouri Botanical Garden Library."
There is an interesting annecdote at the bottom of page 52 of the first issue (Vol. 1, No. 1 (1899)). If you scroll down to the bottom of the page, you will see a reference to Epipactis helleborine in Toronto prior to 1898.