. Botany of the southern states. In two parts. Part I. Structural and physiological botany and vegetable products. Part II. Descriptions of southern plants. Arranged on the natural system. Preceded by a Linnaean and a dichotomous analysis. Plants. Fig. Fork-veined leaf. Parallel-veined leaves. (2.) Parallel-veined leaves are those in which the veins pro- ceed from their origin to their termination without any subdi- vision ; the veins being connected by minute, parallel, straight veinlets, passing perpendicularly from one to the other. The veins of this variety either run from the base of
. Botany of the southern states. In two parts. Part I. Structural and physiological botany and vegetable products. Part II. Descriptions of southern plants. Arranged on the natural system. Preceded by a Linnaean and a dichotomous analysis. Plants. Fig. Fork-veined leaf. Parallel-veined leaves. (2.) Parallel-veined leaves are those in which the veins pro- ceed from their origin to their termination without any subdi- vision ; the veins being connected by minute, parallel, straight veinlets, passing perpendicularly from one to the other. The veins of this variety either run from the base of the leaf to the apex, as in Corn, the Lily, Grains, and as seen in Fig. 41, a.; or from the midrib to the margin, as in the Canna and Arum Walteri, <kc. (Fig. 41, b). Of this latter variety there are com- paratively few specimens in temperate climates, but they be- come more abundant as we approach the equatorial regions. Parallel-veined leaves are characteristic of monocotyledons. (3.) Reticulated or net-veined leaves are those the veins of which branch and ramify in all directions, forming a complete network. (Fig. 42.) This variety of leaves is characteristic of dicotyledonous plants, and they are the most varied in their forms, and comprise the greater proportion of leaves of tem- perate climates. 88# There are two varieties of venation in the reticulated leaves, occasioned by the origin of the primary veins. If the veins take their rise along the midrib and proceed to the margin, giving the leaf, in structure, a resemblance to a feather, it is called the Feather-veined. When the veins that originate at the base To what class of plants do they belong ? What are parallel-veined leaves ? Examples? What are reticulated veined leaves ? What class of plants do they characterize ?—38. How many varieties in reticulated veined leaves ? What are feather-veined leaves ? ?,. Please note that these images are extracted from scanned page images that may have been digitally enhance
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