MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 41 
color. Leaflets obovate-cuneate, deeply crenate or cleft with rounded obtuse teeth. 
Flowers about 7 mm. in diameter, in a branched leafy cyme. Cup sparingly hirsute, in 
age 7-9 mm. in diameter. Bractlets and sepals oblong-ovate, acute or mucronate, about 
equal in length. Petals yellow, obovate-cuneate, slightly truncate or emarginate, about 
equalling or sometimes exceeding the sepals. Stamens 15-20, with short filaments and 
anthers, the latter with nearly spherical sacs. Pistils very numerous; style terminal, 
fusiform. Achenes with a thick corky swelling on the inner side. 
It has been regarded as.a form of the European P. supina, and we still find it under 
that name in most manuals, notwithstanding the fact that the principal distinction has 
been known since the time of Nuttall. It resembles P. swpina in the leaves, which are 
pinnate with several pairs of leaflets, but differs from it not only in the swollen corky at- 
tachment of the achene, but also in the stouter and more upright habit, the larger and 
coarser leaflets and the truly cymose inflorescence. It ranges from New York and On- 
tario to Washington and New Mexico, and occurs also in Mexico and eastern Asia. 
14. Potentilla Nicolletii (Wats.) Sheldon. 
Potentilla Nicolletii Sheld. Bull. Geol. and Nat. Hist. Surv. Minn. 7: 16. In 
part. 1884. 
Rydberg, Bull. Torr. Bot. Club, 23: 260; Britton & Brown, Hl. Fl. 2: 215. 
P. supina var. Nicolletii Wats. Proc. Am.Acad. 8: 553. 1873. 
Intusrrations: Britton & Brown, II. Fl. 2: f. 1926. Pare 6, f. 1; dissection of 
flower, f. 2; nearly mature pistil, f. 3; stamens, f. 4; fruiting hypanthium and calyx, 
ine: 
Stems spreading, more branched and more hairy than in P. paradova, very slender. 
Stipules broadly ovate, acute, subentire or sinuate, 5-10 mm. long. Lower leaves pinnate 
with few leaflets, the upper trifoliolate and much reduced, sparingly hairy and thin. — Leaf- 
lets obovate-cuneate with more acutish teeth than in P. paradova, the terminal generally 
much larger than the lateral ones, 5-25 mm. long. Flowers falsely racemose from the 
axils of the reduced upper leaves, about 5 mm. in diameter. Cup sparingly hirsute, in 
fruit very short and broad, about 6 mm. in diameter. Bracts and sepals oblong-ovate, 
mucronate, subequal, or the bracts a little smaller. Petals obovate-cuneate, about equal- 
ling the sepals. Stamens 10-15.  Pistils numerous ; style terminal, fusiform. Achenes 
smooth, with a thick corky swelling on the inner side. 
This is much nearer the European P. supina, haying the same prostrate habit, small 
leaflets and falsely racemose inflorescence, but the achenes are of the same structure as in 
