File:The Canadian field-naturalist (1973) (19899386743).jpg

Title: The Canadian field-naturalist
Identifier: canadianfieldnat1973otta (find matches)
Year: 1973 (1970s)
Authors: Ottawa Field-Naturalists' Club
Subjects:
Publisher: Ottawa, Ottawa Field-Naturalists' Club
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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1973 Pringle: Spread of Vincetoxicum in Ontario 31
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Figure 2. Distribution records of Vincetoxicum species naturalized in Ontario. Dates indicate earliest records of the species in each county, regardless of status. Counties, main map: C, Carleton; D, Durham; F, Frontenac; G. Glengarry; HI, Halton; Hs, Hastings; M. Middlesex: N. Northumberland; O, Ontario; Wl, Welland; Wn, Wentworth. MunicipaUties, inset maps: B. Burlington; D. Dundas; P, Pickering Township; T, Metropolitan Toronto; WF, West Flamborough Township. evaluation as an ornamental perennial. It seems quite possible that it was actually V. medium which was planted, and that the populations of V. medium later found in Ottawa spread from this introduction. Vincetoxicum medium was found in Cart- wright Township (near Burketon), Durham County, in 1963 (Kirk 6834, CAN, TRT). This population, when visited by the author in 1971, consisted of a large colony in a moist opening among white cedars, with a smaller colony on a hilltop a short distance away (Pringle 1287, HAM, OAC). The density of V. medium in the less heavily shaded parts of the main colony was sufficient to exclude almost all other vegeta- tion, except for a few raspberry canes. In more densely shaded sites, the stems of V. medium were less crowded but still numerous, climbing to a height of 2 m on the cedars. One plant of V. medium was found by Clar- ence Frankton in a low field near the Thames River north of Thorndale, Middlesex County, in 1966 (Frankton 1941, DAO). At Latta, in Hastings County, R. Hainault and I. D. Macdonald found V. medium present in "large colonies on both sides of the road" (Hainault & Macdonald 4979, CAN). The ex- tent of this population indicates that it must have been established for several years prior to its discovery. The earliest record of V. medium in the Hamilton area is a specimen in TRT collected by William Scott in 1900. The locality is given merely as "Hamilton", with no indication as to whether the specimen represents a wild or cul- tivated plant. No further collections of V. me- dium were made in this area until 1965, when two specimens were brought to the author for

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