. Elementary botany. Botany. FOLIAGE LEAVES. 389 in holding it in the expanded position. The mechanical tissue in the framework alone could not support the leaf. Turgescence of the meso- phyll is needed in addition. 757. Cut or lobed leaves.—In many leaves, the indentations on the margin are few and deep. Such leaves pre- sent several lobes the pro- portionate size of which is dependent upon the depth of the indentation or "; Several of the maples, oaks, birches, the poison iv}-, thistles, the dandehon, etc., have lobed leaves. Where the indentation reaches to or very near t
. Elementary botany. Botany. FOLIAGE LEAVES. 389 in holding it in the expanded position. The mechanical tissue in the framework alone could not support the leaf. Turgescence of the meso- phyll is needed in addition. 757. Cut or lobed leaves.—In many leaves, the indentations on the margin are few and deep. Such leaves pre- sent several lobes the pro- portionate size of which is dependent upon the depth of the indentation or "; Several of the maples, oaks, birches, the poison iv}-, thistles, the dandehon, etc., have lobed leaves. Where the indentation reaches to or very near the midrib the leaf is said to be cut. A study of various leaves will show all gradations from simple leaves with jjlane edges to those which are cut or divided, as in compound leaves, and the lobes are often variously indented. 758. Divided, or compound leaves.—The rose, sumac, elder, hickory, walnut, locust, pea, clover, American creeper, etc., are examples of divided or compound leaves. The former are pin- na tely compound, and the latter are palmately compound. The leaf of the honey-locust is twice pinnately compound or bipin- nate, and some are three times pinnately compound.* It is. Fig Lubed leaves of oak forming a m(jsait * Some of the different terms used to express the kinds of compound leaves are as follows: Unifoliate (for a single leaflet, as in orange and lemon where the com- pound leaf is greatly reduced and consists of one pinna attached to the petiole by a joint). Bijolititc for one with two leaflets; trijoUalc for one with three leaflets, as in the clo\-er; plurijoliale for many leaflets. Odd pinnate for a p>innate leaf w-ith one or more pairs of leaflets and one odd leaflet at the 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 Atkinson, George Francis, 1854-1918. New Yor
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