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Plants which climb by the aid of spontaneously revolving and sensitive petioles Clematis Tropaeolum Maurandia, flower-peduncles moving spontaneously and sensitive to a touch Rhodochiton Lophospermum internodes sensitive Solanum, thickening of the clasped petioles Fumaria Adlumia Plants which climb by the aid of their produced midribs Gloriosa Flagellaria Nepenthes Summary on leaf-climbers.
We may suspect that, owing to the principle of correlation, the power of movement has been transferred to the flower-peduncles from the young internodes, and sensitiveness from the young petioles. Rhodochiton volubile. A long flexible shoot swept a large circle, following the sun, in 5 hrs. 30 m.; and, as the day became warmer, a second circle was completed in 4 hrs. 10 m.
But they are not quite so sensitive to a weight as those of the Rhodochiton, for loops of thread weighing one-eighth of a grain did not always cause them to bend. This plant presents a case not observed by me in any other leaf- climber or twiner, namely, that the young internodes of the stem are sensitive to a touch.
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