238 RI K A RD STERNER 



Sarmatiiu Middle Russia, between the steppe district in the south and about 

 the northern Hmit of the oak in the north; southernmost Finland, Estland, Lett- 

 land, Lithuania, and Poland; the North German plain to about the line from the 

 West Prussian — Pomeranian border to the Harz; South East Sweden (Oland, Got- 

 land, north-eastern Smaland, Falbygden, Ostergotland, eastern Narike, Soderman- 

 land, southeastern Vastmanland, and Uppland; about this see further later on 

 Chapt. xii). This area corresponds to Drude's »die ostbaltische Waldregion» 

 (Drude, for instance, 1890, p. 373)- 



Sidmt/a7ifis: The North German plain west of Sarmatia, in the south to the 

 line Harz — Luxemburg; Holland, Denmark with its islands, South- West Sweden 

 and the lower parts of South Norway. (In his »West Baldc region* Drude also 

 includes Belgium, and northern France dow n to Brittany and a large part of Great 

 Britain, all of which Engler includes in his » Atlantic province ».) 



Balticiim = Sarmatia + Subatlantis. (Hence not quite the same sense as Drude, 

 1890, gives the term.) 



Central Europe: Central and eastern France, Switzerland, Germany south of the 

 Balticum, Austria, and Czechoslovakia. The higher mountain regions are excluded. 



Hercynia: in the extension Drude gives it (Drude 1902). 



Cassubia: the western part of Sarmatia in the East to the Dnjepr and the 

 Valdai-hill. 



South Europe: the South European Peninsulas and south-eastern France. 



As has been mentioned, I have not considered it possible at the present time 

 to lay down special types of distribution for the species which have a wide dis- 

 tribution in the north of Russia north of the oak-limit. Nevertheless I have 

 provisionally laid down variants of distribution types in respect of such species 

 as in all probability have such a distribution. 



The types of distribution I have considered myself able to establish for con- 

 tinental species are as follows :i 



I. Meridional species. 

 I. Pontic distribution. 



a. for instance, Astragalus austriacus L., Ranunculus illyricus L. (map i, 

 Plate 13), Plantago tenuiflora W. & K. (map 2, Plate 13), 



b. TJie Danubian variant, for instance, Andropogon gryllus L., Iris arenaria 

 W. & K., Astragalus exscapus L., Lactuca quercina L. 



c. variants forming transition types to the Pontic — Central Piuropean and 

 the Ponticosarmatian — Central European type, for instance, Hypericum ele- 

 gans Steph. (Pontic-Hercynian variant), Silene chlorantha Ehrh. (Pontic- 



^ The maps i — 20 mentioned in the following, ilrawn in order to exemplify the types of distribu- 

 tion, arc to be found in Plates 13 — 22 at the end of the paper. 



