OBSERVATIONS ON THE OAKS. 
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hardly exceeds 20 inches in diameter, and 30 feet in 
height,” which is a circumstance I had overlooked, its 
prevailing character there being that of a shrub. 
The Oaks, though a very extensive genus, are con- 
fined to the Northern hemisphere. Besides the nume- 
rous species which pervade the United States, 16 were 
discovered by Nee in Mexico and New Spain, one of 
which, the Q. agrifolia is found in Upper California; 21 
species were added to the Flora of North America by 
Humboldt and Bonpland found also in New Spain; 4 
species were discovered in Japan by Thunberg; 2 in 
China by Bunge; 1 in Cochinchina, and 1 in the island 
of Formosa; 2 very remarkable species with lanceolate 
entire leaves and very long spikes of flow j ers, like those 
of a Chestnut, were met with in Nepaul by Wallich; 
6 other species likewise exist in that portion of India; 
Europe, chiefly the southern part, Northern Africa and 
Armenia afford about 28 species and several varieties; 
Java, Sumatra and the Molucca Islands also produce 19 
species. Thus it appears, of the whole number, (accord- 
ing to the enumeration of Willdenow and more recent 
discoveries,) the Old World contains 63 species, and 
North America, including New Spain, about 74. Of 
these the United States possess about 37, and New 
Spain the same number. To these I may also add an 
additional species from the island of Cuba, nearly allied 
to our Southern Grey Oak, (Q. cinerea ;) this I propose 
to call after its discoverer, M. La Sagra, 
Quercus Sagrjeana, foliis perennantihus oblongo-ellip- 
ticis obovatisque integris s . sublobatis brevi petiolatis obtusis 
nitidis margine revolutis subtus tomentosis nervosis subalbi- 
dis, fructibus binis pedicellis incras satis , cupula hemisphxri - 
ca, squamis appressis , nuce ovata . 
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