28 Mr. Havortii's new Arrangement of the Genus Aloe. 



are white. Colour, I have observed above, although 

 unstable and not to be depended on in most 

 plants, is often in Aloes the best and most perma- 

 nent mark of specific distinction. 



dorsalis. Aloe foliis ensiformibus acuminatis : marginibus dor- 



soque valde spinosis. Muntingl Aloidar. cum icone. 

 Obs. This species may follow A. barbadensis in 

 my arrangement. 



II. On 



