. Essentials of botany. Botany; Botany. Fig. 29. Coiling of Petiole of Dwarf Tropseolum. 74. Tendril-Climbers. — The plants which climb by means of tendrils are very interesting subjects for , but they cannot usually be managed very well in the schoolroom, jj Continued observation soon shows that the tips I of tendrils sweep slowly about in the air until they come in contact with some object about which they can coil themselves. After the tendril has taken a few turns about its sup- port, the free part of the tendril coils into a spiral and thus draws the whole stem toward the point of a
. Essentials of botany. Botany; Botany. Fig. 29. Coiling of Petiole of Dwarf Tropseolum. 74. Tendril-Climbers. — The plants which climb by means of tendrils are very interesting subjects for , but they cannot usually be managed very well in the schoolroom, jj Continued observation soon shows that the tips I of tendrils sweep slowly about in the air until they come in contact with some object about which they can coil themselves. After the tendril has taken a few turns about its sup- port, the free part of the tendril coils into a spiral and thus draws the whole stem toward the point of attachment, as shown in Fig. 28. Some tendrils are leaves or stipules, others are modified stems. 75. Twiners.^ — Only a few of the upper intemodes of tlie stem of a twi- [ij- ner are concerned in producing the movements of the tip of the stem. This is kept revolving in an elliptical or circular path un- til it encounters some roughish and not too stout object about which it then proceeds to coil itself. The direction of the coil- ing varies in different kinds of climbers, some following the course shown in the figure. Fig. 30. Twining Stem of Hop. 1 See article on Climbing Plants, by Dr. W. J. Beal, in the American Nat- uralist, Vol. IV, pp. 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. Boston, Ginn
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