. The elements of structural botany with special reference to the study of Canadian plants ... Plant physiology; Plant anatomy. 120 ELEMENTS OF STllUCTURAL BOTANY. the sub-division is continued Jhrough another stage, the leaf is thrice-pinnate, and so on. Sometimes, as in the leaves of the Tomato, very small leaflets are found between A»^ the larger ones, and this form is described as interruptedly pinnate (Fig. 168). In the palmate or digitate forms the leaflets spread out from the end of the petiole, and, in describing them, it is usual to mention the number of divisions. If there are three,
. The elements of structural botany with special reference to the study of Canadian plants ... Plant physiology; Plant anatomy. 120 ELEMENTS OF STllUCTURAL BOTANY. the sub-division is continued Jhrough another stage, the leaf is thrice-pinnate, and so on. Sometimes, as in the leaves of the Tomato, very small leaflets are found between A»^ the larger ones, and this form is described as interruptedly pinnate (Fig. 168). In the palmate or digitate forms the leaflets spread out from the end of the petiole, and, in describing them, it is usual to mention the number of divisions. If there are three, the leaf is tri-foliolate ; if there are five, it is quinque-foliolate. 181. In the examination of the Mallow we found a couple of small leaf-like attachments on the petiole of each leaf, just at the junction. Fig. 168. with the stem. To these the name stipules was given. Leaves which have not these appendages are exstipulate'. 188. Besides the characters of leaves mentioned above, there re- main a few others to be noticed. With regard to their surface, leaves present every gradation from perfect smoothness, as in Winter- green, to extreme roughness or. 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 Spotton, Henry Byron, 1844-. Toronto, W. J. Gage & Co
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