Mr. Haworth on the Genus Sedum. 173 



account of the Acute-leaved section of the genus Sedum, to- 

 gether with a corresponding tabular and binary view of the 

 same ; to which I have been able to add one apparently un- 

 recorded species from the royal gardens of Kew. 



The specific names in the binary table are distinguished by 

 italics, and their essential characters are added in roman let- 

 ters. 



Hardly any group of plants of such small extent, and all 

 European rock or wall plants too (except, perhaps, th^ third), 

 has been so little understood as the Seda acutifolia, by the 

 best and latest authors on the subject. Even Linnaeus him- 

 self, whose definitions and descriptions are usually unrivaled, 

 gives us (not very clearly) two species only in the last edition 

 of his Species JPlantarum, — viz. 5. reflexum, and S. rupestre; 

 and to the last of these attributes quinquefarious leaves, a 

 character I have never been able to find in any Sedum what- 

 ever ; and yet he cites Sedum riipestr-e, &c. of Dillen. Hort. 

 Elth. p. 342, cum icone, which has multifarious leaves, and is 

 the original S. rupestre. 



Willdenow, in his edition of the Species Plantartitn, added 

 one species {S. virefis), a Portuguese plant, from the Hortus 

 Kewensis, and in his Enumeration of the Plants in the Royal 

 Gardens of Berlin and in page 25 of its Supplement (which 

 is called a more accurate account), several others. But these 

 latter species were published after the death of Willdenow, 

 by Schlechtendal, and very erroneously as to nomenclature, 

 as will appear by the explanatory synonyma hereunder given. 



Four species only of the Seda acutifolia occur in the se- 

 cond edition of the Hortus Kewetisis, one of which is the above- 

 mentioned S. virens from Portugal. Four also, and all Eng- 

 lish, are delineated in English Botany. Seven are found in 

 Link's enlarged Enumeration of the Plants in the Berlin Gar- 

 dens, published A.D. 1821: and I now cultivate thirteen ap- 

 parently distinct species, which I have endeavoured to distin- 

 guish from each other as follows. 



Classis et Ordo. Decandria Pentagynia. 



GeiMs, Sedum Auctorum (exclusa Anacampserote 

 Raiihc.) 



* Acutifolia Nob.: foliis plus minus lineari-subiilatis 

 luevibus nudis, fere mucronalim acutis, subtiis convexis; 

 supra phwiiusculis vel depressis vix turgidc tumescen- 

 tibus: floribus cyuiosis. 



f Loii'ii- 



