Windsor : speoies of thlaspi. 



31 



In dissecting its stomacli I found some sea-weed, and a few pebbles about the 

 size of peas. Tlie immature birds of Colymhus arcticus and C. septentrion 

 alis, bear such a resemblance to each other, both as regards the colour 

 of their plumage as well as size (for both species vary considerably in the lat- 

 ter), that mistakes are doubtless frequently made when examples are obtained ; 

 by comparing them however, the distinction may easily be detected. The 

 upper mandible of the bill of the former will be found to curve downwards 

 at the tip, while that of the latter takes an upward curve, 

 I^orwich, Feb. 28th, 1865. 



SOME SPECIES OF THLASPL 

 By John Windsor, F.L.S. &c. 



In the second series of the Phytologist,'' were published lists of Settle 

 plants (which I purpose in a while to have reprinted in a separate and I hope 

 improved form.) In the number for June 1856, I ventured in speaking of 

 Thlaspi alpestre to express my doubts as to the separating it, as had been 

 done by some, into different forms, varieties or species. 



Becently (1865) I have examined and compared dried specimens of the 

 plant from the neighbourhood of Settle, which has been named Thlaspi 

 Occitanum ( Jord.) or more lately T. occitanicum by Jordan, from being 

 found in Occitania (Languedoc) in France, with specimens from Matlock, or 

 that form which has been called Thlaspi vir&ns. 



I do not find any characteristic differences in the two as to the form of 

 the pouch, its lobes and intervening notch, or the length of the style, all of 

 which are somewhat variable occasionally, even in the same plant. 



I would offer the same remarks as to Thlaspi alpestre^ from Teesdale or 

 ISTorthumberland, in which I do not detect any essential distinctions from the 

 Settle and Matlock plants and this applies also I tliink to Thlaspi alpestre 

 sent by M. Crepin from coppices {bois taillis) at Vignee, l^^amur. 



The Thlaspi montanum also sent by M. Crepin from stony places 

 (" rocailles ") at Han sur Lesse, l^famur, is probably, although much like 

 alpestre, a different plant, as the flowers appear decidedly larger, but there 

 are no pouches present in my specimens, the inflorescence presents a some- 

 what corymbose appearance, which occurs also in alpestre in an early 

 stage of growth, but is afterwards gradually elongated into a raceme of vari- 



