. Essentials of botany. Botany; Botany. STEMS 57. 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
. Essentials of botany. Botany; Botany. STEMS 57. 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. 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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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1908
