TO BOTANY* 147 



In Ruscus, the lower leaves are tern, and the upper 

 ones alternate. 



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 much branched, is best concluded from the ra- 

 dical leaves. 



CHAP. XIV. 

 , OF INTORSION. 



INTORSION, winding, is the flexion or bending of 

 any part of a plant towards one side. 



CAULES volubiles, twining steins, wind either, 



Sinistrorsum, to the left ; as in Tamus, Dioscorea, 

 Kajania, Menispermum, Cissampelos, Hippocratea, 

 Lonicera, Humul us, and Helxine ; or, 



Dextrorsum, to the right; as in Phaseolus, Doll- 

 chos, Clitoria, Glycine, Securidaca, Convolvulus, 

 Ipomaea, Cynanche, Periploca, Ceropegia, Euphor- 

 bia, Tragia, Basella, Eupatorium, and Tournefortia. 



CIRRHI volubiles, twining claspers, wind to the 

 right and back again. Most leguminose plants have 

 Cirrhi of this kind : in Smilax, and in most species 

 of Piper, the petioles are cirrhiferous. 



COROLLA E bend to the left*, in Asclepias, Neri- 

 um, Vinca, Rauwolfia, Periploca, and Stapelia ; and 

 to the right in Pedicularis. 



In Trientalis there is this singularity, that the pe- 

 tals are all imbricate, one side of each folding over 

 the next towards the right. 



t 



* Supposing yourself placed iu the centre, and looking to* 

 wards the South. 



