INTORSION. 44S 



In Coreopsis Alternifolia, and in Antirrhinum Chalepense, 

 the lower leaves are quatern, and the upper ones alternate. 



The natural situation of the leaves in plants that are muck 

 branched is best concluded from the radical leaves. 



CHAP. XIV. 



OF INTORSION. 



INTORSION, zvinding, is the flexion or bending of any pan 

 ©f a plant towards one side. 



Caules Volubiles, twining stems, wind either, 



1. Sinistrorsum, to the left, as in Tamus, ...Dioscorea,...Ra- 

 jania,...Menispermum,...Cissampelos,... Hippocratea,...Loni= 

 cera, ...Humulus, ...and Helxine; or, 



2. Dextrorsum, to the right, as in Phaseolus,...Dolichos,.., 

 Clitoria, . . .Glycine, . . . Securid aca,. . .Convolvulus,. . . IpoMa2A f 

 ,..Cynanche,...Periploca,...Ceropegi a,... Euphorbia,... Tragia, 



BASELLA,...EuPATORIUM,...ai)d TOURNEFORTIA. 



Cirrhi Volubiles, twining claspers, wind to the right, and back 

 again. Most leguminous plants have cirrhi of this kind : in Smilax, 

 and in most species of Piper, the petioles are cinhiferous. 



Corolije bend to the left*, in Asclepias,...Nerium,...Vinca, 



* Supposing yourself placed in the centre, and looking towards the south. 



