321 



tliev attain respectable dimensions wlien allowed to grow iiudis- 

 turbed (p. 317). 



With regard to the general affinities of the Azorenn flora it is 

 remarked that, whilst the plants of the upland moors are in tlie 

 mass European species that do not occur either in Madeira or in 

 the Canaries, most of the characteristic trees and shrubs of the 

 woods are non-European and either exist in the other two groups 

 or are represented there by closely related species (p, 317). It 

 is suggested, in passing, that the European element iti the w^oods 

 was mainly derived by way of the Atlas Mountains (p. 318). 

 The woods of the Azores, as regards their component trees and 

 shrubs, are to be compared with the *' laurel belt ^^ that forms the 

 middle zone of vegetation on the slojoes of Teneriffe. The lower 

 African zone and the higher region of pines as displayed on that 

 mountain are not to be found in the Azores/ their absence being 

 due to lack of the requisite climatic conditions in the first case, 

 and to want of suitable soil conditions on the hi^rh levels of Pico 

 in the second case (p. 319). 



Finally, it is shown that the marked endemism of the Canarian 

 and Madeiran floras is but slightly displayed in that of the Azores. 

 The revolutions in plant-life which are suggested by the presence 

 in the other two groups of representatives of genera now exclu- 

 sively American cannot be predicated for the Azores. On the 

 contrarj^ the Azorean plants supply us with a story of to-day for 

 the upland moor and of yesterday for the mountain wood. 



PRINCIPAL WORKS QUOTED OlS THE FLORA OF THE AZORES. 



(a) ^'TJbersicht der Flora der azorischen Inseln," by M. Seubert 



and C. Hochstetter, in Wiegmann's '^ Archiv fiir Natur- 

 gesehichte; " jahrg, ix. band i. ; Berlin, 1843; accompanied 

 by a large coloured plate illustrating the zones of vegetation 

 on Pico. 



(h) ^^ Flora Azorica/' from the collections and notes of C, Hoclx- 



stetter and his son, by M. Seubert, Bonn, 1844. 



(c) '^Iles Azores (L'Histoire T^aturelle),'' by A. Morelet, Paris, 



1860. The author was a zoologist who was also interested in 

 the flora. 



(d) ^^ Catalogue de la Flore des lies Azores, '^ by H. Drouet, Paris, 



1866. The author, like Morelet his companion, was a 

 French zoologist. 



(e) '^Natural History of the Azores/^ by F. du C. Godnmn, 



London, 1870. It contains Watson's monograi^h on the 

 flora, 



(/) ^'Botany of the Azores,'' by H. C. AVatson, appearing in 



Godman^s work, above-named. 



(g) '' Azores/' by W. F. Walker, 1886, One of the most impor- 

 tant general works on the Azores, 



(h) ^^ Botanical Observations on the Azores/' by W. Trelease. 



8th report of the Missouri Botanical Garden/ St. Louis, 



1897, 



B 



