CLASS XII. ORDER V. 219 



PoTENTiLLA ARGUTA. Piirsh Supjjl. Crowdcd Potf/itUla. 



Stem erect, lower leaves pinnate, hairy and downy; 

 flowers in small corymbs, nearly sessile. 

 Syn. PoTENTiLLA coxFERTiFLOKA. Torrey. 

 BooTiA SYLVESTRis. 2d edition. 



This plant, formerly proposed as a genus, is on more mature 

 inspection, withdrawn. According to Dr. Hooker it is the P. ar- 

 gutaof Pursh, by Bradbury's specimen. 



The whole herb is covered with hairy down. Root leaves and 

 lower stem leaves pinnate, leafets sessile, oval, acute, doubly 

 toothed and slightly cut, the lower ones and sometimes the inter- 

 mediate ones smaller. Stem two feet high, rigid, erect, round, 

 furrowed. Stipules half ovate, acuminate, mostly entire. Upper 

 leaves ternate or simple. Flowers terminal, in small crowded 

 corymbs. Calyx segments downy, alternately lanceolate and 

 ovate. Petals orbicular, white, as long as the calyx. Ar.thers 

 compressed, roundish. Nectary a stellate cavity surrounding the 

 base of the receptacle of the germs, having pits in its five points 

 opposite the narrow segments of the calyx, distinct in the young 

 flower, obliterated in fruit. Seeds oblong, pointed, awnless. 

 Receptacle hairy. 



Found in June 1816, on the precipice behind Bellows' Falls, 

 N. H. Also in Deerfield, Mass. 



226. DRYAS. 

 Dryas integrifolia. Vahl. Mountain Avens. 



Leaves elliptic-ovate, entire; calyx segments lin- 

 ear. 



Syn. Drtas tenella. Pursh. 



A low, ca3spitose,suflfruticose, alpine plant. Leaves alternate, 

 petioled, smooth, evergreen, wrinkled above, white-pubescent 

 beneath, revolute at the margin. Flowers large, white, on soli- 

 tary, elongated peduncles. Seeds with long, plumose, ^silkea 

 awns. I have seen specimens from the White mountains, but 

 have not found it there myself. 



