DICOTYLEDONES. 41 



boundary of the Warm Zone, several herbaceous and 

 arboreous plants ; to which are joined several trees 

 in the Torrid Zone. 



"28. Of a similar extension are the plants with 

 Whirled Flowers (ApocynecB) ; as, the Periwinkle 

 (Vinca), and the Swallow Wort (Asdepias). 



29. The Order of (Papaveracece} spreads over the 

 Temperate Zone. It commences, in the region which 

 lies in the 86th degree N.L., with the small herbs of 

 the Fumitory-plants (Fumaria\ gradually becoming 

 handsomer and herbaceous, as the Celadine (Cheli- 

 donium) and Poppy (Papaver) ; finally becoming 

 shrubby in the Bocconia. 



30. The Order of the Guajacancs is a native of 

 the Torrid Zone, but passes over into the conti- 

 guous parts of the Temperate Zone, nearly as far as 

 the 42d degree N.L. The Genus of Storax (Styrax) 

 belongs to the latter. 



31. The Order of Jasmines consists of shrubs and 

 trees, which are dispersed over the Temperate to- 

 wards the Warm Zone. Individuals of this class 

 are, the Privet (Ligustrwn), the Lilac (Syringd), the 

 Ash (Fraxinus), and the common Jasmin (Jasmi- 

 nuni) ; of which the Privet penetrates furthest into 

 the colder half of the Temperate Zone. 



32. The Cacti are almost exclusively natives of the 



