COMPARISON OF MAEOCCAN FLORA. 421 



origin ; so that, on the whole, I am disposed to regard it as a 

 very distinct svib-division of the Mediterranean province, which 

 owes its peculiarities partly to the conservation of types once 

 common to West Europe and North Africa, but which have 

 been eliminated in those regions, and partly to the effect of 

 isolation and climate on the progeny of species still existing in 

 those regions. 



APPENDIX F. 



Comparison of the Maroccan Flora with that of the Mountains 



of Tropical Africa. 



By Joseph Dalton Hookeb. 



As was to have been anticipated, the Maroccan Flora contains 

 most of the European species which have been collected on the 

 mountains of Abyssinia and of the Bight of Biafra, which 

 alone of the tropical African Alps have been botanically ex- 

 plored. Of these the former have been visited by Schimper 

 and various collectors ; whilst the mountains of the pestilential 

 West African const, of Fernando Po, 9,500 feet, and the Ca- 

 meroons Mountains, upwards of 13,000 feet, have been ascended 

 for botanical purposes only by Gustav Mann, when employed 

 for the Royal Gardens of Kew. 



The results of the latter were published by myself in the 

 ' Joui'nal of the Linnjean Society of London' (vol. vii. p. 171), 

 from whence the following observations are for the most part 

 extracted. They included 26 European species, gathered at ele- 

 vations between 5,000 and 10,000 feet. Most of them are 

 also natives of the Abyssinian Alps, and two-thirds of them 

 are also Maroccan, whilst others wiU probably yet be found in 

 the latter country. 



The following is a catalogue of all the European plants found 

 in the upper regions of the Cameroons Mountains and Fer- 

 nando Po : — 



Cardamine hirsuta 

 Cerastium vulgatum (visco- 



sum, Fr.) . 

 Radiol a Millegrana 



Height 



feet 

 7,000-10,000 



8,000 



7,000 



Where found 



Marocco and Abyssinia 

 Marocco 



