. The elements of botany for beginners and for schools. Plants. SECTION 6.] STEMS. 41 93), as also the shorter ones of the Japanese species, effect the object differ- ently, namely, by expanding the ti|>s of the tendrils into a flat disk, with an adhesive face. This is applied to the supporting object, and it adheres finuly ; then a shortening of the tendril and its brandies by coiling brings up the growing shoot close to the support. This is an adapta- tion for climbing mural rocks or walls, or the trunks of trees, to which ordinary tendrils are unable to cling. The Ivy and Poison Ivy atta
. The elements of botany for beginners and for schools. Plants. SECTION 6.] STEMS. 41 93), as also the shorter ones of the Japanese species, effect the object differ- ently, namely, by expanding the ti|>s of the tendrils into a flat disk, with an adhesive face. This is applied to the supporting object, and it adheres finuly ; then a shortening of the tendril and its brandies by coiling brings up the growing shoot close to the support. This is an adapta- tion for climbing mural rocks or walls, or the trunks of trees, to which ordinary tendrils are unable to cling. The Ivy and Poison Ivy attain the same result by means of aerial rootlets (78). 100. Some tendrils are leaves or parts of leaves, as those of the Pea (Fig. 35). The na- ture of the tendril is known by its position. A tendril from the axil of a leaf, like that of Pas- sion-flowers (Fig. 92) is of course a stem, i. e. a branch. So is one which terminates a stem, as in the Grape-Vine. 101. Spines or Thorns (Fig. 95, 96) are commonly stunted and hardened branches or tips of stems or branches, as are those of Hawthorn, Honey-Locust, etc. In the Pear and Sloe all gradations occur between spines aud spine-like (spiuescenl) branches. Spines. 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 Gray, Asa, 1810-1888. New York : American Book Company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectplants, bookyear1887
