[51]

Comptes Rendus. Tom XIX 1844. p. 300 Dutrochet says that different individuals of Solanum dulcamara, twine spontaneously more & have their leaves spirally arranged to right & left —

like left & right-handed shells— still better like Verruca

If we did not know passage wd seem impossible.—

[Climbing plants, p. 12: "The leaves of twining-plants rise from the stem (before it has twined) either alternately, or oppositely, or in a spire; in this latter case the line of insertion of the leaves and the course of revolution or of twining coincide. This fact has been well shown by Dutrochet*, who found different individuals of Solanum Dulcamara twining in opposite directions, and these had their leaves spirally arranged in opposite directions.
* Comptes Rendus, 1844, tom. xix. p. 295, and Annales des Soc. Nat. 3rd series, Bot., tom. ii. p. 163."]

(over)

[51v]

Scientific Memoirs Part IV. p. 278, 286.

similar case in winding of leaves.—

[Dutrochet, René Joachim Henri. 1844. Recherches sur la volubilité des tiges de certains végétaux et sur la cause de ce phénomène. Comptes rendus hebdomadaires des séances de l'Académie des Sciences 19: 295-303. See CUL-DAR75.137-144: "Scientific memoirs 4/276 variability in twisting of leaves in sp. & genus in Alluvium".]