284 REVIEWS. [September, 



The ' Flore de TAlgerie/ published in 1847, by the author of 

 the present Catalogue, comprehended about 1,800 species ; this 

 new list comprehends at least 2,600. The extent of the country 

 from which this result is obtained is larger than the area of 

 France, which produces about twice as many species as Algeria 

 does. In France the vegetation is more varied and abundant 

 than in the north of Africa, and this is probably owing to the 

 diversity of surface, to atmospheric variations, greater range of 

 altitude, etc. 



The representatives of the European Flora, or the species 

 common to both quarters, attain their maximum at Bonn, and 

 decrease towards the west. The most intimate relations of this 

 Flora are with the Floras of Spain, Portugal, and the south and 

 middle of France. 



The plants common to the Algerine and British Floras are, in 

 round numbers, about 550, or somewhat more than one-third 

 of our species are common both to the north of Africa and to 

 the British Isles. Several of these, such as Adonis autumnalis, 

 Delphinium Ajacis (Consolida ?) , Sinapis nigra, Thlaspi perfolia- 

 tum, etc., are naturalized or local species in England, while others, 

 such as Ranunculus hederaceus, R. Flammula, R. repens, R. bul- 

 bosus, R. sceleratus, Papaver Rhceas, P. dubium, Fumaria offici- 

 nalis, Thlaspi Bursa-jmstoris, are widely and almost universally 

 distributed over the British Isles. 



In the Order Leguminifera, 52 species, enumerated in M. 

 Munby's catalogue, are found here, either as unquestioned na- 

 tives, or as naturalized species, or as stragglers. Of the Order 

 Crucifera 27 are common to both Floras. Of the Order Umbel- 

 lifer<s 22 species are common. In Compositce about 40 species 

 are common. Nearly 60 species of Graminem are found in both 

 Great Britain and Algeria. 



In the Flora of Belgium, the number of Leguminifera common 

 to both the north African Flora and to the before-mentioned, is 

 about 30, the Crucifers are about 20, the Umbellifers 15, the 

 compound plants 32, and the Graminece 47. These statements 

 of the relative proportions of some of the chief botanical Orders 

 in Algiers, England, and Belgium, will bear out the assumption 

 that there are more plants common both to the north of Africa 

 and to the British Isles, than there are common to the former 

 and Belgium. 



