an? MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Annual, 2-4 dm. high, slightly silky-villous, leafy, but stem leaves rather small. 
Stipules linear. Basal leaves pinnate, with 5-10 pairs of slightly silky-villous leaflets diy- 
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 Jvesia 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 Ivesiae. Whatever may be the fate of that genus this species should remain a Poten- 
tilla, as it lacks every character that distinguishes Ivesia from Potentilla. I have placed it 
nearest to the Multijugae, as it shows most relationship to that group. The following 
specimens belong here: 
California or Oregon: Newberry (Williamson Exp.), 1855 (Rhett Lake). 
Oregon: Coville & Leiberg, No. 1, 1896; Leiberg, No. 2386, 1896. 
Potentilla Newberryi arenicola. 
InLustRATION: PLATE 45, f. 7. 
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. 
gg. Potentilla Hippiana Lehm. 
Potentilla leucophylla Torr. Ann. Lye. Nat. Hist. N. Y. 2: 197. 1827. Not Pall. 
Potentilla Hippiana Lehm. Stirp. Pug. 2: 7. 1880. 
Don, Gard. Dict. 2: 558; Walp. Ann. 2: 480; Lehm. Rey. Pot. 62. 
Wats. Proc. Am. Acad. 8: 555; Porter and Coult. Syn. Fl. Col. 36; 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, ibid. 3: 496; Rydb. Fl. Neb. 
21: 16: Bull. Torr. Bot. Club, 24: 2; Britt. & Brown, Ill. Fl 2: 213. 
