. The Canadian field-naturalist. 332 The Canadian Field-Naturalist Vol. 95. Vaccinium myrtilloides Michx. Figure 2. Distribution of Vaccinium myrtilloides. TRT, US, and WIS, nor have the authors, after repeated searches on the Island, found the plant there. Szczawinski (1962) thought that V. myrtilloides was introduced to the Fraser Delta (he listed no specimens from Vancouver Island); however, Hebda(1979) and inlitt. regards the species as native both in Fraser Delta and on Vancouver Island, but quite disjunct — nearest stations lie some 200 km ENE into the interior lodgepole pine forest of s
. The Canadian field-naturalist. 332 The Canadian Field-Naturalist Vol. 95. Vaccinium myrtilloides Michx. Figure 2. Distribution of Vaccinium myrtilloides. TRT, US, and WIS, nor have the authors, after repeated searches on the Island, found the plant there. Szczawinski (1962) thought that V. myrtilloides was introduced to the Fraser Delta (he listed no specimens from Vancouver Island); however, Hebda(1979) and inlitt. regards the species as native both in Fraser Delta and on Vancouver Island, but quite disjunct — nearest stations lie some 200 km ENE into the interior lodgepole pine forest of south central British Columbia. (b) Altitudinalrange. Throughout its range V. myrtilloides occurs from about sea level to rarely above 1200 m above sea level on mountain slopes. 4. Physical Habitat (a) Climatic relations. Since V. myrtilloides occurs throughout several of Rowe's (1972) Forest Regions, viz., Subalpine, Boreal, Great Lakes — St. Lawrence and Acadian, we infer that the species is adapted to a wide range of climatic conditions. It tolerates a potential growing season of 200 d in the south to 100 d in the north (Atlas of Canada 1974), and occurs in subarctic areas of widespread permafrost (Brown 1967) to temperate regions. Moreover, following the Thornthwaite Classification system as applied to Canada by Sanderson (1948), V. myrtilloides ranges from a perhumid climatic type on the East Coast to a dry subhumid type in the west. Numerous small-scale climatic descriptions are also available, , Gaudreau (1979: pp. 12-15). Moore (1965) regards the species as winter hardy. Indeed Bell and Burchill( 1955) observed that in the absence of snow cover during winter both V. myrtilloides and V. angustifolium are killed back to ground level, and that during spring cold snaps, up to 16% dead florets are found in exposed buds. Reader (1979) found that spring frost damage in blossoms began at -1°C and was complete at -10°C. Bell and Burchill (1955) conclude that their study
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