. Introduction to botany. Botany. THE STEM AJSTD THE LEAF â 75 The development and mode of operation of tendrils is espe- cially interesting (figs. 58 and 59). The tendril is either a leafless, thread-lilte branch, as in the grapevine, or a highly modified leaf or part of a leaf, as in the cucumber. When a living and active tendril comes mto contact with any suitable. Fig. 58. Bur cucumber (Sicyos), a tendril climber At a, b, c, d, e, and/successive stages in the history of tendrils are shown. The tendril, at first curved, becomes straighter, then curls up at the tip, and finally (after becomi
. Introduction to botany. Botany. THE STEM AJSTD THE LEAF â 75 The development and mode of operation of tendrils is espe- cially interesting (figs. 58 and 59). The tendril is either a leafless, thread-lilte branch, as in the grapevine, or a highly modified leaf or part of a leaf, as in the cucumber. When a living and active tendril comes mto contact with any suitable. Fig. 58. Bur cucumber (Sicyos), a tendril climber At a, b, c, d, e, and/successive stages in the history of tendrils are shown. The tendril, at first curved, becomes straighter, then curls up at the tip, and finally (after becoming attached to some object) coils itself into a close spiral and thus draws the plant with considerable force toward the sustaining object support for the climber, this contact brings about more active growth on the exterior side of the tendril (that side which does not touch the foreign object). In this way the tendril is made to coil about the support. Soon after the tendril has become attached, the free portions are thrown into coils, and the shortening which results draws the stem of the climber closer to the 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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