to the Rocky Mountains. 197 



126. Potentilla pennsylvanica, f3. arguta, Serfage in 

 DC. prod. ii. p. 531. P. arguta, Pursh fi. supp. p. 736. 

 (non Lehm. pot.) Richardson in app. Frank, nar. ed. 2. p. 20. 

 P. confertiflora, Torrey fi. i. p. 499. Geum agrimonoides, 

 Pursh fi. i. p. 154. Bootia sylvestris, Big. fi. bost. ed. 2. 

 p. 206. 



Hab. On the Missouri. 



Obs. There has been a great deal of confusion respect- 

 ing this plant, chiefly on account of the imperfect manner in 

 which it was described by Linnaeus, and the earlier writers 

 who have noticed it.* Dr. Richardson found it in Arctic 

 America. The P. pennsylvanica of Gmelin appears to be a 

 distinct species. 



J 27. P. supina, L. Pursh fi. i. p. 356. DC. prod. ii. 

 p. 580. On the Mississippi and Missouri. 



12S. P. humifdsa, JVult. gen. i. p. 310. DC. prod. ii. 

 p. 574. On the Missouri. 



129. P. fruticosa, L. Pursh fi. i. p. 355. DC. prod. 

 ii. p. 579. On the Rocky Mountains. 



130. P. leucophylla, erecta ; foliis pinnatisectis, lobis 

 oblongis, profunde argute serratis, utrinque sericeo-candican- 

 tibus ; stipulis lanceolatis, acutis, integerrimis vel unidentatis; 

 floribus laxe corymbosis ; laciniis calycinis lanceolatis, inte- 

 gerrimis, bracteolis angustioribus ; receptaculo piloso ; car- 

 pellis laevibus. 



Desc. Stem about 15 inches high, erect, terete, villous-pubescent, sim- 

 ple. Leaves all pinnalely divided, petiolate ; petioles 1-2 inches long; 

 leaflets in the radical leaves about 11, oblong - , and lanceolate-oblong, an 

 inch or more in length, rarely with small intermediate ones, very silky on 

 both sides, particularly beneath, which is nearly white ; margin deeply and 

 acutely serrate ; the serratures acuminate. Stipules three-fourths of an 

 inch long, lanceolate, acuminate, entire, or with a single obscure tooth. 



* See Flora of the Northern and Middle States, 1. c. 



