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in the central part, and also in oiir country. Let me 

 therefore only say about this species, that I myself always 

 had the impression, that we hâve got to do hère with a 

 river-plant. Most of the localities are situated along our 

 big rivers and we must not forget, that a species like 

 this one is likely to obtain an unnatural distribution 

 through human influence. 



The species, which Prof. Tansley has recorded to 

 me as nearly confined to the "Breckland-area", that is to 

 say, only growing there and in some places quite near 

 to the south-west and the west of it, consequently in the 

 counties of Essex, Middlesex, Hertfordshire, Bedfordshire, 

 Lincolnshire etc. are: Herniaria glabra L. (var. vera Ba- 

 bingt.), Scleranthiis perennis L., Holosteum umbellatum L., 

 Silène conica L., Veronica triphyllos L., Phleum Boehmeri 

 Wib. and Muscari racemosum Mill. We will treat them 

 again the one after the other. Herniaria glabra, common 

 in Germany, rare in Belgium and there confined to the east 

 part, gives us entirely taz impression to be a river-plant. 

 It cornes in along the Meuse and the rivers coming from 

 Germany and it pénétrâtes far to the west, as far as 

 Vianen, Gorkura etc. It is therefore not impossible, that the 

 English stations dépend upon this. About Scleranthus 

 perennis literally the same may be said as about Hernia- 

 ria glabra, The only différence is, that this species seems 

 to hâve a somewhat greater spreading-power as the 

 former. It has namely also been found in the neigh- 

 bourhood of Naarden-Bussum (mouth of the river Vecht) 

 and along the old Rhine-bed of Van Eeden (Heems- 

 kerk, Breesaap, Hillegom, etc.) In conformity with this in 

 England also it has advanced somewhat farther from the 

 "Breckland-sands" and has namely also been recorded 

 from Radnorshire, whilst the Herniaria does not go any 

 farther than Lincolnshire and Middlesex. Holosteum um- 

 bellatum is doubtless a river-plant and this species again 



