Mutants and hybrids of the oenotheras . curves together with a statement of the ranges will sufficientlyindicate the nature and degree of discontinuity present. The ranges of mean values of the leaf-characters in the individ-ual plants were as follows : Length. Width. Width-=-length. Millimeters. Millimeters. Per 30 32 54 It will be noted that the break between the mean values of leaf-width and that between the mean ratios of width to length are slightbut sufficient. If a larger number of specimens had been used therange would
Mutants and hybrids of the oenotheras . curves together with a statement of the ranges will sufficientlyindicate the nature and degree of discontinuity present. The ranges of mean values of the leaf-characters in the individ-ual plants were as follows : Length. Width. Width-=-length. Millimeters. Millimeters. Per 30 32 54 It will be noted that the break between the mean values of leaf-width and that between the mean ratios of width to length are slightbut sufficient. If a larger number of specimens had been used therange would have been extended somewhat and it is not improbablethat they would overlap some, and yet the unsatisfactory character of MUTANTS AND HYBRIDS OF THE OENOTHERAS. 45 the ratio of width to length as a measure of leaf-form would not allowus to infer from such overlapping that the two species are not abso-lutely distinct with respect to the form of the leaves. This fact willbecome convincingly apparent upon reference to Plate XXII, in which. 0 35 30 35 40 45 - 50 55 Fig. 8. Variation in ratio of width to length in the leaves of Onagrarubrinervis and , expressed in per cents. 0- rubrinervis:Range, 20-48; M., ±; <r, ± ; C. V., ± per lamarcUana: Range, 28-53 ; ±; <r, ±; C. V., ± per cent. are contrasted the leaves from the specimen of 0. lamarckiana havingthe minimum mean ratio and those of the specimen of 0. rubriiuhaving the maximum mean ratio. According to this statistical meas- 46 MUTANTS AND HYBRIDS OF THE OENOTHERAS. ure, these two lots of leaves are the most nearly identical in form of anytwo plants, belonging to these two species, which were to the difference of outlines as shown in the plate could be added themarked crinkling of the lamarckiana leaves, a character which disap-pears on pressing, the discontinuity would be even more obvious. Interpretation of stat
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