77 



the slightest doubt as to their being S. rupestre. On my stock being 

 exhausted, I begged my friend Miss Holland to send me the further 

 supply which has been communicated to the Society. I saw the 

 same plant growing in abundance, together with S. Forsterianum, on 

 the rocks at Barmouth, where the two varieties pass so insensibly in- 

 to each other that it is almost impossible in some cases to draw the 

 line between them. 



Anna Russell. 



Brislington, February 21, 1848. 



[Mr. Watson having done me the honour to mention my name in 

 connexion with the British species of Sedum (Cyb. Brit. 401), I may 

 say that I am quite at a loss to understand how any confusion can 

 exist between plants which appear to me so extremely different as 

 Sedum reflexum and Sedum rupestre. It will be of little avail to 

 point out discrepancies where I can find no point of similarity except 

 in the colour of the flowers. Still, without noticing botanical cha- 

 racters, I cannot avoid calling attention to the difference in size ; 

 S. reflexum being four times larger than S. rupestre, and when the 

 two are cultivated in company its stems stand out amongst those of 

 rnpestre " as oxen among sheep." The discrepancies between S. ru- 

 pestre and S. Forsterianum are much more subtle ; the size, habit and 

 entire superficial appearance are similar, colour alone excepted, yet 

 the colour is so constantly and so decidedly distinct that they are 

 instantly separable by this single character. In cultivation the discre- 

 pancy becomes still more marked, and the different constitutions of 

 the plants is observable : placed on a dry wall at Peckham, rupestre 

 thrives, but Forsterianum dies ; placed under the drip of water, 

 Forsterianum thrives, but rupestre dies. I have never found rupestre 

 except on the driest parts of exposed rocks : I have never found 

 Forsterianum except in the spray of waterfalls. I was not fortunate 

 enough to meet with it at Barmouth, where Mrs. Russell records its 

 occurrence. — E. N.]. 



On the Equisetum Jluviatile of the ' London Catalogue of British 

 Plants' By Edward Newman. 



Since Mr. Watson published his remarks (Phytol. iii. 1) in defence 

 of the omission of Equisetum fluviatile from the 'London Catalogue 

 of British Plants, 1 that gentleman has examined the Linnean speci- 



