. The Canadian record of science. Natural history. Observations upon some Noteworthy Leaf Variations. 285 spective positions indicated), the intermediates presenting graduated sizes. As will be seen, these leaves are ovate in form and they have a distinctly cordate base. The leaves of the entire branch show an average area of about sq. cm., ranging from sq. cm. to sq. cm. From this it appears that the same plant produces two sets of leaves under the same general conditions of growth, in which the extreme variation is in the ratio of 1 , the average variation being in th
. The Canadian record of science. Natural history. Observations upon some Noteworthy Leaf Variations. 285 spective positions indicated), the intermediates presenting graduated sizes. As will be seen, these leaves are ovate in form and they have a distinctly cordate base. The leaves of the entire branch show an average area of about sq. cm., ranging from sq. cm. to sq. cm. From this it appears that the same plant produces two sets of leaves under the same general conditions of growth, in which the extreme variation is in the ratio of 1 , the average variation being in the ratio of 1 While we are familiar with the fact that many trees exhibit very striking differences under essentially the same general conditions of growth, the present case appears to be of a most extraordinary nature in- asmuch as the different forms appear to be wholly localized and confined to particular regions of the plant; while the the differences in form and size particularly, are such as, in the case of the basswood, are usually associated with extremes of light and shade. To complete our description of this par- ticular shrub, it should be noted that in addition to growing on that side of the clump which only received the afternoon sum as greatly modified by the proximity of a high building. Fig. 4. I,onicera tartarica. Leaves from the plagiotropic branches of a much pruned shrub, reduced through correlation, x \. 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 Natural History Society of Montreal. Montreal, Natural History Society
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