. The Canadian field-naturalist. Natural history; Sciences naturelles. 2006 Catling and Miiwjw: in Saskatchewan 429 51*00' 50° 30'. 50° 00' 49° 30' 103° 00' 102° 00' Figure 1. Saskatchewan (left) showing location of Whitewood study area (right). Collection localities of Amelanchier used in the study are indicated by dots. The Moose Mountain ecodistrict is shaded. The collection site of A. sanguinea is indicated by "S" and dashed line connected to the dot. Methods In June 2005, during late flowering, 111 specimens of Amelanchier were collected and measured from 51 sites i
. The Canadian field-naturalist. Natural history; Sciences naturelles. 2006 Catling and Miiwjw: in Saskatchewan 429 51*00' 50° 30'. 50° 00' 49° 30' 103° 00' 102° 00' Figure 1. Saskatchewan (left) showing location of Whitewood study area (right). Collection localities of Amelanchier used in the study are indicated by dots. The Moose Mountain ecodistrict is shaded. The collection site of A. sanguinea is indicated by "S" and dashed line connected to the dot. Methods In June 2005, during late flowering, 111 specimens of Amelanchier were collected and measured from 51 sites in the Whitewood - Moose Mountain area of southeastern Saskatchewan (Figure 1). No more than five specimens were collected at each site and sites are defined as at least km apart. Specimens were select- ed to represent the extremes of variation present at a site. For each specimen, lengths of lowest pedicel in an inflorescence of average size, average petal length in lowest flower in the inflorescence, average sepal length in lowest flower in the inflorescence, the plant habit (stoloniferous or not, height, number of stems), leaf pubescence (scale 1-4, 1 = glabrous, 4 = densely pubes- cent) and shape of die tip of a larger leaf (scale 1 -5 with 1 = truncate, 5 = pointed). Stoloniferous shrubs were defined as having more than 6 separated stems and being less than 2 m in height. Non-stoloniferous shrubs were defined as having 5 or fewer stems together and exceeding 2 m in height. The data were analysed using Principal Components Analysis (PCA), regression and histograms. PCA re- duced dimensionality of six characters (Table 1), to two allowing for an evaluation of grouping and indi- cation of pattern of variation. Histograms evaluated pedicel length with respect to habitat for different eco- districts. F-ratios based on the comparison of the mean square variance of the regression model to the mean square of the residual indicated relationship and sig- nificance of individ
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