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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, Roem. 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, E- 
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 
