Archangelica officinalis, Hoffmann. 



Arctic zone and mountain regions of Europe. The stalks 

 are used for confectionery ; the roots are of medicinal 

 use. Only in our Alps would this herb fully establish its 

 value. The root is biennial and used in the distillation 

 of some cordials. 



Arctostaphylos uva ursi, Sprengel. 



Alpine and Arctic Europe, North Asia and North America. 

 A medicinal small shrub, which here could best be reared in 

 the heath-moors of our Alpine regions. 



Argania Sideroxylon, Eoem. and Schult. 



The Argan-tree. Western Barbary, on dry hills. Its 

 growth is here found to be slow ; but it is a tree of 

 longevity. Though comparatively low in stature, its foliage 

 occasionally spreads to a circumference of 220 feet. It 

 sends out suckers from the root. The fruits serve as food 

 for cattle in Morocco ; but here the kernels would be more 

 likely to be utilized by pressing the oil from them. 



Aristolochia Serpentaria, L. 



The Snake-root of North America. The root of this trailing 

 herb is valuable in medicine ; it contains a peculiar volatile 

 oil. Several other Aristolochise deserve culture for medi- 

 cinal purposes, for instance, Aristolochia ovalifolia (Gruaco) , 

 and A. anguicida, from the mountains of Central America, 

 should they prove hardy. 



Arnica montana, L. 



Colder parts of Europe. This pretty herb is perennial, and 

 of medicinal value. It is eligible for our sub-alpine 

 regions. The active principles are: Arnicin, volatile oil, 

 cupron and capryl acid. 



Arracacha xanthorrhiza, Bancroft. 



Mountain regions of Central America. An umbelliferous 

 herb. The roots are nutritious and palatable. There are 

 yellow, purple and pale varieties. 



Artemisia Absinthium, L. 



The Wormwood. Europe, North and Middle Asia, and 

 North Africa. A perennial herb, valuable as a tonic and 



