204 ME. B. T. LOWI^E ON THE TEGETATIOJT OE THE DEAI> SEA. 



between 30 and 40 of the species of the southern Ghor extenct 

 into Sind, and about 13 are found in the Canary Isles ; tliis ap- 

 pears to me a fact worthy of note, since these countries are upon 

 the eastern and western limits of the North- African desert-flora. 



The relation which the southern Ghor bears to that of the 

 peninsula of Aden, seeing how little is known of the botany of 

 central Arabia, seems to me a subject of special interest. Eleven 

 of the most characteristic plants of the southern extremity of the 

 Dead Sea valley are common to it and to the peninsula of Aden ; 

 and, considering how very limited the floras of the two localities 

 are, this is not an unimportant number. In both places Beseda 

 amhlyocarpa seems to be by far the most common plant. 



In both places the number of species and genera is small com- 

 pared with the number of natural orders to which they belong. 

 My 94 species belong to 33 orders, giving an average of rather 

 more than three species to each. 



The most numerous orders in the flora of the Dead Sea are 



Cruciferse, containing 13 species ; 

 Compositse ^ 11 „ 



LeguminossB „ 6 „ 



Chenopodiacese „ 6 „ 



Zygophyllacese „ 5 „ 



Griffith 



whilst at Ad ^ 



your * Transactions/ there are 



r 



11 species of Leguminoss&, 



9 „ Capparidese, 



7 „ Euphorbiacese, 



5 „ Compositse, 



showing the much more decided tropical character of the latter 

 flora. 



None of the plants peculiar to Aden were found by me in the 

 Dead Sea valley ; and I know of only one well-marked species 

 peculiar to this region and to the north of Arabia and the adjacent 

 deserts of Suez and Persia, the Cleome trinervia, Fresen., which is 

 the most characteristic plant of northern Arabia. 



Lastly, I may mention that I found two most distinct varieties 



Mahauwat Wadies 



F. 



the common Ijevant species ; these plants, growmg side by siae 

 in abundauce without any intermediate forms, seem to me to point 

 to two distinct species of Fagonia^ however wide their distribution 

 and variation may be. 







