. The Canadian field-naturalist. 372 The Canadian Field-Naturalist Vol. 83 10 i B. PAPYRIFERA B. CORDIFOLIA. 0 I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 HYBRID INDEX VALUES Figure 8. Frequency of hybrid index values of B. papyrifera and B. cordifolia. Cofftparison of B. papyrifera and B. cordifolia The specimens from Grand Manan have made it possible to compare these taxa from a relatively restricted area. A hybrid index for eight measurable characters was prepared (Table 2) and a bar graph based on the hybrid index values for each specimen is shown in Figure 8. The hybrid index of a typical B. p
. The Canadian field-naturalist. 372 The Canadian Field-Naturalist Vol. 83 10 i B. PAPYRIFERA B. CORDIFOLIA. 0 I 2 3 4 5 6 7 8 9 10 II 12 13 14 15 16 HYBRID INDEX VALUES Figure 8. Frequency of hybrid index values of B. papyrifera and B. cordifolia. Cofftparison of B. papyrifera and B. cordifolia The specimens from Grand Manan have made it possible to compare these taxa from a relatively restricted area. A hybrid index for eight measurable characters was prepared (Table 2) and a bar graph based on the hybrid index values for each specimen is shown in Figure 8. The hybrid index of a typical B. papyrifera ranged from 0 to 4 whereas that of B. cordifolia ranged from 10 to 16. In general, individuals of these two taxa were clearly distinct from one another; however, two individuals of B. papyrifera with hybrid index values of 8 and 9 fell in the range of B. cordifolia and one specimen of B. cordifolia with a hybrid index value of 6 overlapped with those of B. papyrifera. A few specimens of B. papyrifera found elsewhere in eastern Canada (Brittain and Grant, 1967) had 56 somatic chromosomes and had certain hybrid characteristics. However, the specimens studied here with intermediate hybrid index values had the same chromosome numbers as those found for the typical species. In the pictorialized scatter diagram (Figure 9), measurements of the style length and guard cell length were plotted for each individual. It may be seen that B. cordifolia and B. papyrifera are clearly distinct from one another. The individual of B. papyrifera with a hybrid index value of 9 (No. 450) was close. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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