By rapidly lengthening the cells on the outer side of its stem more than on the inner side, the former becomes convex, the latter concave; that is to say, a section of spiral is formed by the new shoot, which, twining upward, devitalizes its benefactor as it goes.
"Wild Flowers Worth Knowing"
Neltje Blanchan et al
That is the drain that devitalizes the home towns more than all the city mail order houses.
"The University of Hard Knocks"
Ralph Parlette