THE CONTINENTAL FLORA OF SOUTH SWEDEN 



315 



themos (p. 319), Seseli libanotis (p. 334), Trifolium montanum (p. 301), and Viola 

 lupestris (p. 319), and the following for which no distribution maps have been 

 drawn up: Centaurea jacea (it might be questioned whether it is spontaneous in 

 other places than Skane, Falbygden and the Omberg district), Fragaria viridis 

 (richly distributed on the Central Swedish plains, especially in Uppland, Vaster- 

 gotland and Ostergotland), Medicago falcata (universally distributed in Skane, 

 south-western Uppland, and especially on the Upsala plain. However, it may 

 perhaps be questioned, whether it is spontaneous in the latter case. In the other 

 arable districts its occurrence is surely not spontaneous). 



Regarding this distribution on the arable plains of certain species a pretty re- 

 markable fact may be noticed: The plains in the eastern part of Central Sweden 

 seem to be more rich in occurrences of steppe species than the ones of southern- 

 most Sweden. Three species, As- 

 perula tinctoria, Polygala comosa, 

 and Seseli libanotis, are rather lacking 

 in southernmost Sweden, whilst 

 other species as Ranunculus po- 

 lyanthemos, Trifolium montanum, 

 and Viola rupestris are less distri- 

 buted in the last mentioned region 

 than in Central Sweden. 



Attention may also here be paid 

 to the fact that Crepis praemorsa 

 and Ranunculus polyanthemos, widely 

 distributed in the herbaceous hill- 

 sides on the Central Swedish plains, 

 have many occurrences in the South 

 Swedish hill districts, north-eastern 

 Smaland and southern Ostergotland, 

 Kolmarden, western Vastmanland, 

 and southernmost Dalarna. This 

 fact coincides very well with the 

 species not being distinct steppe 

 species and with their wide distri- 

 bution in the Central European 

 highlands. 



The cause of the numerous oc- 

 currences of the steppe species on ^. ,,., . , , ■, .- r^ 



'■ '^ '^ Fig. II. the whole distribution ol Lrepis praemorsa 



the arable plains, as has been men- i„ ^^e .Scandinavian North. 



tioned, in the first place rests on Q: uncertain occurrences; cf. Plate 17. 



