ANNOTATIONS AND ADDITIONS. 195 



and 14000 feet, (about 12790 and 14920 English,) which 

 we often visited, we did not find, either in the Andes of 

 Mexico or in those of Quito and Peru, any thing which could 

 recall the small creeping alpine willows of the Pyrenees, the 

 Alps, and Lapland (S. herbacea, S. lanata, and S. reticulata) . 

 In Spitzbergen, where the meteorological conditions have 

 much analogy with those of the Swiss and Scandinavian 

 snow-mountains, Martins described two dwarf willows, of 

 which the small woody stems and branches creep on the ground, 

 and which lie so concealed in the turf-bogs that their small 

 leaves are only discovered with difficulty under the moss* 

 The species found by me in Peru in 4 12' S. latitude, near 

 Loxa, at the entrance of the forests where the best Cinchona 

 bark is collected, and described by Willdenow as Salix 

 humboldtiana, is the one which is most widely distributed 

 in the western part of South America. A sea-shore species, 

 S. falcata, which we found on the sandy coast ' of the 

 Pacific, near Truxillo, is, according to Kunth, probably only 

 a variety of the above; and possibly the fine and often 

 pyramidal willow which accompanied us along the banks of 

 the Magdalena, from Mahates to Bojorque, and which, 

 according to the report of the natives, had only extended so 

 far within a few years, may also be identical with Salix 

 humboldtiana. At the confluence of the Rio Opon with the 

 Magdalena, we found all the islands covered with willows, 

 many of which had stems 64 English feet high, but only 

 8 to 10 inches in diameter. (Humboldt and Kunth, Nova 

 Gen. Plant. T. ii. p. 22, tab. 99.) ' Lindley has made us 

 acquainted with a species of Salix from Senegal, and there- 



