Tendril perversion
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Tendril perversion is a geometric phenomenon sometimes observed in helical structures in which the direction of the helix transitions between left-handed and right-handed. Such a reversal of chirality
A tendril of Bryonia dioica exhibiting tendril perversion
Cucurbita pepo exhibiting tendril perversion
A telephone handset cord exhibiting tendril perversion
Tendril
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In botany, a tendril is a specialized stem, leaf or petiole with a thread-like shape used by climbing plants for support and attachment, as well as cellular invasion by parasitic plants such as Cuscut
Tendril perversion
…in which the direction of the helix transitions between left-handed and right-handed. Such a reversal of chirality is commonly seen in helical plant tendrils and telephone handset cords. The phenomenon was known to Charles Darwin, who wrote in 1865…
A curling tendril
Tendril of a common climbing plant
Nepenthes rafflesiana upper pitcher with coiled tendril.
Virginia creeper vine beginning tendril