ANNOTATIONS AND ADDITIONS. 387 



lations, or meteorological phenomena. I remarked long ago that the 

 Southern Hemisphere for example has many plants belonging to the 

 natural family of Rosacese, but not a single species .of the genus 

 Rosa. We learn from Claude Gay that the Rosa chilensis described ] 

 by Meyen is only a wild variety of the Rosa centifolia (Linn.), which 

 has been for thousands of years a European plant. Such wild va- ' 

 rieties (i..e. varieties which have become wild) occupy large tracts 

 of ground in Chili, near Valdivia andOsorno. (Gray, Flora Chilen- 

 sis, p. 340.) 



In the tropical region of the Northern Hemisphere, we also found 

 only one single native rose, our Rosa montezumse, in the Mexican 

 highlands near Moran, at an elevation of 8760 (9336 Engl.) feet. 

 It is one of the singular phenomena in the distribution of plants, 

 that Chili, which has Palms, Pourretias, and . many species of Cac- 

 tus, has no Agave ; although A. americana grows luxuriantly in 

 Roussillon, near Nice, near Botzen, and in Istria, having probably 

 been introduced from the New Continent since the end of the 16th 

 century, and in America itself forms a continuous tract of vegeta- 

 tion from Northern Mexico across the Isthmus of Panama to the 

 southern part of Peru. I have long believed that Calceolarias were 

 limited, like Roses, exclusively to one side of the Equator ; of the 

 22 species which we brought back with us, not one was collected to 

 the north of Quito and the Volcano of Pichincha ; but my friend 

 Professor Kunth remarks that Calceolaria perfoliata, which Bous- 

 singault and Captain Hall found at Quito, advances to New Gra- 

 nada, and that this species, as well as C. integrifolia of Santa Fe de 

 Bogota, were given by Mutis to the great Linnaeus. 



The species of Pinus, which are so frequent in the tropical An- 

 tilles and in the tropical mountains of Mexico, do not pass the 

 Isthmus of Panama, and are not found in the equally mountainous 

 parts of the tropical portion of South America, and in the high 

 plains of New Granada, Pasto, and Quito. I have been both in 

 the plains and on the mountains from the Rio Sinu, near the Isth- 

 mus of Panama, to 12 S. lat. ; and in this tract of almost 1600 

 geographical miles the only forms of needle-trees which I saw 

 were a Taxus-like species of Podocarpus with stems 60 (64 Eng.) 

 feet high (Podocarpus taxifolia), growing in the Pass of Quindiu 

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