FLORAL PROVINCES. 
35 
mosses and saxifrages, comprising all the 
Arctic and all the Alpine localities, and 
characterized by mosses, lichens, gentians, 
saxifrages, and similar forms. The second 
region is that of cruciferous plants, extend- 
ina: from the Arctic circle, and from the 
a 
lower limits of Alpine forms on the moun¬ 
tains, over the whole north of Europe, 
including the British Isles, and part of 
northern Asia. There are about nine hun¬ 
dred species of which five hundred and 
forty-eight are found in the temperate 
regions of the northern hemisphere, 
comprising the turnip, cabbage, and other 
common vegetables. The third province, 
that, of the mint tribes, or the midland flora, 
comprises the countries bordering the 
Mediterranean, and in this province tropi¬ 
cal forms first make their appearance. 
Fourth—Japan and the adjacent continent, 
the region of the buckthorn and honey¬ 
suckle tribe. Fifth—The eastern part of 
North America. Sixth—The southern part 
of North America, the region of magnolias. 
Seventh—Mexico and the West Indies, the 
region of the cactus and the palm. Eighth 
