monique at mail.bio.tamu.edu
Fri Jan 21 17:25:40 EST 2000
This topic came up a few years back. The consensus was that the
direction of twining in twining plants varied by genus or family, not
by hemisphere. This is probably true of phyllotaxy, too.
Cynthia Galloway wrote:
> I received the following question was posed by a friend and I'd
> appreciate any help.
> My question is, do they twist clockwise in the southern hemisphere?
> "What do you know about helical twisting in plants? Lots of plants
> are twiners and all or most twist counterclockwise (viewed from the
> top) like a common screw. In some mosses the leaves are neatly
> helically twisted around the stem, and in others, the individual leaves
> are neatly helically twisted, hence my interest. What is the underlying
> reason or mechanism that causes the twist, and why counterclockwise? I
> have looked at the web and can't find anything technical."
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