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Show ANNOTATIONS AND ADDITIONS. 337 lations, or meteorological phenomena. I remarked long ago that the Southern Hemisphere for example has many plants belonging to the natural family of Rosaoere, 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 Ro a centifolia (Linn.), which has been for thousands of years a European plant. Such wild varieties (i. e. varieties which have become wild) occupy large tracts of ground in Chili, near Valdivia and Osorno. (Gay, Flora Chilensis, p. 340.) In the tropical region of the Northern Hemisphere, we also found only one single native rose, our Rosa montezumre, 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 Cactus, has no Agave j although A. americana grows luxuriantly in Roussillon, near Nice, near Botzen, and in !stria, having probably been introduced from the New Continent since the~ end of the 16th century, and in America itself forms a continuous tract of vegetation 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 j of the 22 species which we brought back with us, not one was collected to the north of Quito and the Volcano of Pichincha j but my friend Professor Kunth remarks that Calceolaria perfoliata, which Boussingault and Captain Hall found at Quito, advances to New Granada, and that this species, as well as C. integrifolia of Santa Fe de Bogota, were given by Mutis to the great Linnreus. The species of Pinus, which are so frequent in the tropical Antilles 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 S.inu, near the Isthmus of Panama, to 12° S. lat. j and in this tract of almost 1600 geographical miles the only forms of needle-tree 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 29 |