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Polygala Senega, L. 
North America. A perennial herb. The root is of medicinal 
value ; its acrid principle is Saponin. 
Prangos pabularia, Lindley. 
Plateaus of Mongolia and Tibet. A perennial fodder-herb, 
much relished by sheep, eligible for cold and arid localities, ■ 
and deserving naturalization on our alpine pasture-ground. 
Other perennial species exist near the Mediterranean Sea 
on the Atlas, the Caucasus and the Indian Highlands. P, 
pabularia is regarded by some as the Silphium of Arrianus. 
Pringlea antiscorbutica, W. Anderson and E. Br.* 
The Cabbage or Horse-Radish of Kerguelen’s Island. The 
perennial long roots taste somewhat like Horse-Radish. The 
leaves in never-ceasing growth are crowded cabbage-like 
into heads, beneath which the annual flower-stalks arise. The 
plant ascends mountains in its native island to the height of 
1400 feet, but luxuriates most on the sea-border. To Arctic 
and other Antarctic countries it would be a boon. Probably it 
would live not only on our shores, but also on our Alps. 
Whalers might bring us the roots and seeds of this remark- 
able plant, which seems to have never entered into culture 
yet. Not even its flowers in a perfect state are known. 
The plant was used by the celebrated Captain Cook and all 
subsequent navigators, touching at yonder remote spot, 
as Cabbage, and it proved to possess powerful properties 
against scurvey. Dr. Hooker observes, that Pringlea can 
sectionally be referred to Cochlearia. The whole plant is 
rich in a pungent volatile oil. Through culture important 
new culinary varieties may likely be raised from this plant. 
The taste of this vegetable in its natural growth is like 
Mustard and Cress, and the Kerguelen’s Land Cabbage, 
when boiled, proved a wholesome and agreeable substitute 
for the ordinary Cabbage. 
Prosopis dulcis, Kunth. 
Prom Mexico to the southern parts of the La Plata States. 
A thorny shrub, growing finally to a tree, adapted for live- 
fences. This is one ot the species, yielding the sweetish 
