. The Canadian field-naturalist. . e f Figure 3. (a) male flower; (b) female flower; (c) lepidotehair;(d) pollen grain; (e) berries;(f) achenes. Scales: (a) and (b) 12x; (c) 400x; (d) lOOOx; (e) 3x; (0 2x. 3. Distribution and Abundance (a) Geographic range: In Canada, the species is limited to the Prairie and southern parklands of the Prairie Provinces (Figure 4). The distribution given for Alberta by Scoggan (1977)—"N to Medicine Hat"—is incom- plete; I have collected the species at Drumheller. It is most abundant in southwestern Saskatchewan and southeastern Alberta; in other parts
. The Canadian field-naturalist. . e f Figure 3. (a) male flower; (b) female flower; (c) lepidotehair;(d) pollen grain; (e) berries;(f) achenes. Scales: (a) and (b) 12x; (c) 400x; (d) lOOOx; (e) 3x; (0 2x. 3. Distribution and Abundance (a) Geographic range: In Canada, the species is limited to the Prairie and southern parklands of the Prairie Provinces (Figure 4). The distribution given for Alberta by Scoggan (1977)—"N to Medicine Hat"—is incom- plete; I have collected the species at Drumheller. It is most abundant in southwestern Saskatchewan and southeastern Alberta; in other parts of the Prairie Provinces it is much less frequently encountered, but can be locally abundant. In the USA, it occurs in the Great Plains, east to Minnesota and Iowa, and south to New Mexico (Great Plains Flora Association 1977). (b) Altitudinal range: S. argentea appears to be limited to ahitudes below about 1000 m in the Prairie Provinces. The species occurs between 900 and 1000 m altitude in southwestern Alberta, and in the Wood Mountain area in Saskatchewan. In eastern Manitoba it occurs at altitudes of about 250 m. 4. Physical Habitat (a) Climatic relations: Within the area of its distribution, S. argentea appears to be indifferent to variations in climate, and occurs over the entire range of temperature and precipitation prevailing in the southern Prairie Provinces. (b) Physiographic relations: Shepherdia argentea is most common in a rather well defined habitat-type that can be described as: non-saline to slightly saline, often somewhat calcareous soils with a narrow pH range (Table 1) of sandy loam to sand textures; usually poorly drained and gleyed, classed as "carbonated" gleysol, or in the parklands, humic gleysol (National Soil Survey Committee 1974). Within this habitat-type distinction can be made between dry-mesic, mesic, and wet-mesic sites. In the southern prairies and in the parklands the habitat-type is commonly associated with river or creek bank
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