. Practical botany. Botany. ( PltACTICAL BOTANY Tfiidfil cliinhers attach themselves to the stems or branches of other plants or to inanimate objects by means of special, slender, tlrread-shaped, leafless organs called tendrils. These are modified leaves or parts of a leaf, as in the pea (Fig. 306) ; or modified branches, as in the grape, the Virginia creeper (Fig. 48), and the ]^^)assi()ii flower. ^\"hen a living and active tendril comes into contact with a support, this contact causes growth tu take place more rapidly on the exterior side of the. Fig. 49. A tropical Smikii, a tendril
. Practical botany. Botany. ( PltACTICAL BOTANY Tfiidfil cliinhers attach themselves to the stems or branches of other plants or to inanimate objects by means of special, slender, tlrread-shaped, leafless organs called tendrils. These are modified leaves or parts of a leaf, as in the pea (Fig. 306) ; or modified branches, as in the grape, the Virginia creeper (Fig. 48), and the ]^^)assi()ii flower. ^\"hen a living and active tendril comes into contact with a support, this contact causes growth tu take place more rapidly on the exterior side of the. Fig. 49. A tropical Smikii, a tendril climber o, tendril coiled about a portion of the stem; I, tendril coiled about ;> leafstalk; br, a young branch; (, young unattached tendrils tendril (that side which does not touch the foreign object), and thus the tendril is made to coil about the support. The sensitiveness of some tendrils is almost inconceivably great. Those of the star, wild, or bur cucumber QSicijnx) are stimu- lated to curve by a moving weight of ^oo^oiyo ^^ ^ grain, or one eighth of the smallest amount which can be perceived by the most sensitive part of the human skiir (the face). After a tendril has become attached the free portions are also thrown into coils and tlius the plant is drawn closer to the support. As a result of its attachment the tendril liecomes stronger and often eoiisideral)ly thicker. In some plants, as the Vhginia creeper, the tendrils are enabled to 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York [etc. ] Ginn and company
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
