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Updated: June 29, 2025
But in this latter species it has diminished in the basal part of the main petiole, in which alone it resided in C. montana; whilst it has increased in the abruptly bent terminal portion. Clematis flammula. The rather thick, straight, and stiff shoots, whilst growing vigorously in the spring, make small oval revolutions, following the sun in their course.
Ultimately the two tendrils belonging to the same petiole, if they do not come into contact with any object, loosely cross each other behind the stem, as at B, in fig. 7.
The petioles of the young leaves are very sensitive: a single light rub with a twig caused one to move perceptibly in 5 m., and another in 6 m. The former became bent at right angles in 15 min., and became straight again in between 5 hrs. and 6 hrs. A loop of thread weighing 0.125th of a grain caused another petiole to curve. Tropaeolum pentaphyllum.
This is an excellently constructed climber. The tendrils on a fine plant were eleven inches long, with the petiole bearing two pairs of leaflets, only two and a half inches in length. They revolve more rapidly and vigorously than those of any other tendril-bearer observed by me, with the exception of one kind of Passiflora.
The leaf-stalk, or petiole, is a foot thick where it sprouts from the trunk; and before it reaches the leaflets it is a solid beam of ten or twelve feet long, while the circular fan or leaf itself is nine or ten in diameter! A single leaf of the murichi palm is a full load for a man.
This ring presented, both in a transverse and longitudinal section, a closely similar structure to that of the stem. It is a singular morphological fact that the petiole should thus acquire a structure almost identically the same with that of the axis; and it is a still more singular physiological fact that so great a change should have been induced by the mere act of clasping a support.
One was perceptibly curved in 1 hr. 10 m., after being lightly rubbed, and became considerably curved in 5 hrs. 40 m.; some others were scarcely curved in 5 hrs. 30 m., but distinctly so in 6 hrs. 30 m. A curvature was perceptible in one petiole in between 4 hrs. 30 m. and 5 hrs., after the suspension of a little loop of string.
The leaf-stalk, or petiole, is a foot thick where it sprouts from the trunk; and before it reaches the leaflets it is a solid beam of ten or twelve feet long, while the circular fan or leaf itself is nine or ten in diameter! A single leaf of the murichi palm is a full load for a man.
With rare exceptions, the petioles are sensitive only whilst young. They are sensitive on all sides, but in different degrees in different plants; and in some species of Clematis the several parts of the same petiole differ much in sensitiveness. The hooked tips of the leaves of the Gloriosa are sensitive only on their inner or inferior surfaces.
The petioles always bend towards the side which is pressed or touched, at different rates in different species, sometimes within a few minutes, but generally after a much longer period. After temporary contact with any object, the petiole continues to bend for a considerable time; afterwards it slowly becomes straight again, and can then re-act.
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