112 MEMOIRS FEOM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVEESITY 



Annual, 2-4 dm. high, slightly silky-villous, leafy, but stem leaves rather small. 

 Stipules linear. Basal leaves pinnate, with 5-1 pairs of slightly silky-villous leaflets div- 

 ided to near the base into 3-5 oblong-spatulate or linear segments. Stem leaves similar, 

 but with 2-4 pairs of less divided leaflets. Cyme diffuse, with slender pedicels which are at 

 last drooping, but not abruptly reflexed just below the hypanthium. Hypanthium vil- 

 lous, about 5 mm. in diameter. Bractlets and sepals ovate-lanceolate, sub-equal. Petals 

 white, obcordate, exceeding the sepals. Stamens 20. Pistils numerous ; style slender, 

 but glandular and somewhat thickened below. 



This species was described as Ii'esw, in 1857, transferred to Potentilla in 1865, then 

 returned to Ivesia in 1876, and lastly again placed in Potentilla in 1887, together with the 

 other Icesluc. Whatever may be the fate of that genus this species should remain a Poten- 

 tilla, as it lacks every character that distinguishes Ivevia from Poterdilla. I have placed it 

 nearest to the MuJtijugae, as it shows most relationship to that group. The following 

 specimens belong here : 



California or Orqjon : Newberry (Wilhamson Exp.), 1855 (Rhett Lake). 



Oregon: Coville & Leiberg, No. 1, 1896; Leiberg, No. 2386, 1896. 



Potentilla Newberryi arenicola. 



Illustration : Plate 4-5, /. 1. 



Stems many from the caudex, prostrate or spreading. Leaflets fewer, 3-6 pairs. 

 Flowers somewhat larger. ^ 



It grows in sandy places. 

 Washington : Thos. Howell, 1896 (Wallula). 

 Oregon : Leiberg, No. 382, 1894. 



§ 20. LEUCOPHYLLAE. 



99. Potentilla Hippiana Lehm. 



Potentilla kucophjUa Torr. Ann. Lye. Nat. Hist. N. Y. 2 : 197. 1827. ITot Pall. 



Potentilla Hippiana Lehm. Stirp. Pug. 2 : 7. 1830. 



Don, Gard. Diet. 2 : 558 ; Walp. Ann. 2 : 480 ; Lehm. Rev. Pot. 62. 



Wats. Proc. Am. Acad. 8 : 555 ; Porter and Coult. Syn. Fl. Col. 86 ; Rothrock, 

 Wheeler's Exp. 6 : 112: Coulter, Man. Rocky Mts. 84 ; Wats. & Coult. in Gray, Man. 

 Ed.6: 159; Rose, Cont. U. S. Nat. Herb. 1 : 120; Rydberg, ihid. 3: 496; Rydb. Fl. Neb. 

 21 : 16; Bull. Torr. Bot. Club, 24 : 2; Britt. & Brown, 111. FL 2: 213. 



