from The Century Dictionary and Cyclopedia
- n. In botany, the so-called diurnal sleep of leaves: a modification of diaheliotropism. See the quotation under paraheliotropic.
Sorry, no etymologies found.
I have thought that you would not object to my giving precedence to paraheliotropism, which has been so little noticed.
I have been very much interested by your new facts on paraheliotropism, as I think that they justify my giving a name to this kind of movement, about which I long doubted.
Like those of some Cassiae its leaves take an almost perfectly vertical position, when at noon, on a summer day, the sun is nearly in the zenith; but I doubt whether this paraheliotropism will be observable in England.
It is curious that a hybrid Hedychium in my garden shows scarcely any trace of this paraheliotropism, while both the parent species are very paraheliotropic.
I was particularly glad to hear of the strongly marked cases of paraheliotropism.