MR. J, WINDSOR OK THLASPI ALPESTRE. 197 



noticed by Smith himself, is represented, perhaps, as too ob- 

 cordate, whilst it should be oblong-obovate. However, some 

 of my specimens from Matlock present the obcordate form, show- 

 ing that this character, although mostly a good one, is somewhat 

 variable. This obcordate form of the pouch certainly appertains 

 more to the Settle or Malham plant, named occitanvm (Jor- 

 dan), than to the Matlock one, named virens (Jordan). I find, 

 on examining the pouches of the Teesdalc plant {alpestre. Bab.), 

 that the same variations occur, and that they have not their ex- 

 tremities always rounded, but sometimes present the obcordate 

 form, so marked a character of the Settle or Malham plant. 



In a specimen I have from near Namur, Belgium, the pouches 

 generally present this obcordate form ; and it seems altogether 

 like the larger specimens of the Malham plant. 



As to the aspect or habit of the different forms of Thlaspi 

 alpestrej the stature of the Matlock plant is usually higher and 

 more erect than that of the Settle or Malham one, and the Tees- 

 dale form agrees with the former. As to the colour or hue of 

 the plant, it is in the Matlock form (as described and figured in 

 * English Botany,' 1st edit.) strikingly glaucous ; on the other 

 hand, in the Malham form, it is, as far as I have seen, always 

 green and totally destitute of glaucescence. Smith does not 

 allude to the green, nor Babington to the glaucous hue; yet I 

 think they are important distinctions. 



I have specimens of both forms from Teesdale; and it is pos- 

 sible that the green form may grow near Matlock ; but I have not 

 yet met with it there. 



It would seem, then, that there are sufficient marks of dis- 

 tinction to constitute at least two varieties or subspecies of 

 Thlaspi alpestre ; and if so, I would venture to ask whether the 

 names lately assigned to them are appropriate. 



To the Matlock form, distinguished chiefly, so far as I have yet 

 found it, by its glaucous hues and the oblong-obovate form of its 

 pouches, along with its generally taller growth, the name virens 

 has been applied. 



To the Settle or Malham form, characterized by its green hue, 

 its shorter and less erect stature, and especially by its obcordate 

 pouches with divergent lobes, a more distinct notch, and a pro- 

 ininent septum or ridge (a prolongation of the pedicel) between 

 them, the name of occitanum^ or more lately occitanicum (Jor- 

 ^an), has been applied. Both these names seem objectionable, 

 inasmuch as the plant met with at Matlock, called virens, is 



