. Plants; a text-book of botany. Botany. FOLIAGE LEAVES: FUNCTION, STRUCTURE, ETC. 35 B. Structure of foliage leaves. 28. Gross structure.—It is evident that the essential part of a foliage leaf is its expanded portion or Hade. Often the leaf is all blade {aw Figs. 7, 8, IS) ; frequently there is a longer or shorter leaf-stalk {petiole) which helps to put. Fig. 25. Two types of leaf venation. The figure to the left is a leaf of Solomon's seal (Polygonaluin), and shows the principal veins parallel, the very minute cross veinlets being invisible to the naked eye, being a monocotyl type. The figu
. Plants; a text-book of botany. Botany. FOLIAGE LEAVES: FUNCTION, STRUCTURE, ETC. 35 B. Structure of foliage leaves. 28. Gross structure.—It is evident that the essential part of a foliage leaf is its expanded portion or Hade. Often the leaf is all blade {aw Figs. 7, 8, IS) ; frequently there is a longer or shorter leaf-stalk {petiole) which helps to put. Fig. 25. Two types of leaf venation. The figure to the left is a leaf of Solomon's seal (Polygonaluin), and shows the principal veins parallel, the very minute cross veinlets being invisible to the naked eye, being a monocotyl type. The figure to the right is a leaf of a \villow, and shows netted \'eiiis, llic main central vein (mid- rib) sending out a series of parallel branches, which are connected with one another by a network of veinlets, being a dicotyl type.—After Ettingshausen, the blade into better light-relation (see Figs. 1, 0, 17, 20, 2(i); and sometimes there are little leaf-like appendages {stip- ules) on the petiole where it joins the stem, whose func- tion is not always clear. Upon examining the blade it is seen to consist of a green substance through which a. 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 Coulter, John Merle, 1851-1928. New York, D. Appleton and company
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