1911-12.] BOTANICAL SOCIETY OF EDINBURGH 



41 



its slender stems and small leaves are half hidden in the 

 moss, so that the stellular flowers seem to be scattered 

 over the carpet as if by accident. Next the creeping, 

 radiating mats of Cerastium trigynum associate themselves 

 with these two plants. Later on Gnaphalium supinum 

 steps on the scene, or the long red creeping shoots of the 

 five-leaved lady's mantle (AlcJiemilla pentaphyllea) become 

 interlaced, so as to form connected masses." 



Brockmann-Jerosch (4) gives the results of examinations 

 of nineteen examples of snow-flushes, recording the number 

 of times each species was noted. Rubel (7) also gives 

 results from forty-eight stations. Both authors worked in 

 the Rhaetian Alps, an extensive area of high altitude. The 

 following table gives — for Scottish species only — the 

 number of times of occurrence recorded from the above 

 two memoirs : — 



The species recorded for snow-flushes by Oettli (6) for 

 the Churfurst and Sentis areas are also included in the 

 above table. 



These lists are characteristic for stations on crystalline 

 rocks. The catalogue from calcareous rocks is much longer, 

 with few Scottish species, and has Salix retusa as a char- 

 acteristic plant. The Scottish lists, taken along with other 

 notes, suggest that the same association is represented as 

 on the crystalline rocks of Switzerland. It is probable 

 that in Scotland Cerastium cerastioides and Veronica 



