THE NATURALIST. 



able length, and hence the plant according to its age, yaries considerably in 

 rstatiire and general aspect. The styles also by age are apt to fall off, except 

 perhaps in one or two more recent shoots from the same stock. The appear- 

 ance of the plant may be also somewhat influenced by its place of growth. 



I may here remark that it seems, at least not unfrequently, to affect a 

 locality in which lead or calamine is existing, as near Settle, and also at 

 Matlock. In such situations it is often associated with Arenaria verna. 



The Thlaspi jierfoliatum from Oxfordshire, although presenting much 

 the aspect of Thlaspi alpestre, is I believe a distinct species, but at present I 

 should feel a dififi-culty in making the same admission for virens or occi- 

 tanicum. 



In Thlaspi alpestre^ (including the Settle, Matlock, and Teesdale plants) 

 the lobes of the silicle at first quite approximate the style, but as the pouch 

 developes itself, they somewhat diverge, and thus generally a distinct notch 

 is produced. This is often visible in the same plant, on comparing the lower 

 more matured pouches with the upper less advanced ones. 



With regard to the Teesdale plant, I have hitherto only had an oppor- 

 tunity of seeing it in its mature state, Avhen it presents a rather taller stature 

 than is often seen in the Settle or Matlock plants, but this I believe is due 

 simply to a different period of growth, modified perhaps occasionally by 

 differences of soil and situation. 



All at first are rather short in stature, and the inflorescence then has a 

 corymbose or subcorymbose appearance, which afterwards, as the growth 

 proceeds, gradually assumes a racemose or spike-like extension, and thus the 

 height of the plant becomes considerably increased. 



MATERIALS FOR A FLOEA OF WAKEFIELD AND ITS 



IvTEIGHBOUEHOOD. 



By T. W. Gissing. 



{Continued from page 10.) 

 Capsella. D. C. Shepherd's Purse. 

 (7. Bursa-pastoris, D.C. Common Shepherd's Purse. A. Nearly all the year. 

 Common. 



Lepidium. Linn. Pepper Wort. 

 L, campestre^ Br. Common Pepper Wort. A. May— August. Frequent. 



