198 MR. J. WI>'DSOB ON THLASPI ALPESTRE. 



decidedly glaucous, and the plant met with in Craven, &c., 

 named occitanicum (Jordan), is found in so many places besides 

 Occitania (Languedoc), in Trance. Sir J. E. Smith in ' English 

 Botany,' vol. vii. p. 441, well observes that " specific names 

 taken from the local distribution of plants are generally excep- 

 tionable." 



It is not, however, desirable to change the adopted names of 

 plants, unless they are manifestly inappropriate ; otherwise I 

 should take the liberty of proposing that the appellation of 

 Thlas^i alpestre^ species or BXih^^ecie^ glaueescens^ should be given 

 to the Matlock &c. form, and that of Thlaspi alpestre, species 

 or subspecies riVe«5, to the Craven (Settle and Malham &c.) plant. 



Note A. 



The only exception to the glaucous colour of the Tlilaspi ah 

 pestre found near Matlock &c., is in the rosette of root-leaves, 

 especially in the lowest of these, which are sometimes green, thus 

 contrasting distinctly with the glaucescence of those above and 

 of the rest of the plant. This is scarcely shown in the excellent 

 figure of it in the first edition of ' English Botany.' 



On revisiting Matlock and the neighbouring Bonsall on July 

 25, 1867, I searched in vain for the green form occurring near 

 IVIalham and Settle &c. On examining and comparing again 

 the silicles of these two forms, I find my previous account 

 of them confirmed. In the Matlock form they are (in their 

 earlier state) mostly obcordate; but on advancing to full ma- 

 turity they become somewhat more oblong, and the two sides 

 or lobes are in such close apposition as to leave little or no m- 

 tervening notch. In the Malham form the pouches are larger 

 and the lobes more divergent ; hence they become more distinctly 

 obcordate, and the notch more decided ; but the projecting style 

 is of about the same length in both forms. Whether there are m 

 Britain any more than these two forms, species, or subspecies ot 

 what has been called Thlaspi alpestre, I have hitherto seen no 

 specimens enabling me to form an opinion. 



Note B. 

 In conclusion, it may not be inappropriate here to add that 



Arenaria verna seems to be generally associated with both forms 



all 



found 



rule 



