102 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
line, deeply dissected into narrowly oblong segments. Cyme rather few-flowered with 
erect branches. Flowers 12-16 mm. in diameter, on rather slender pedicels. — Hypan- 
thium silky; bractlets linear-oblong, shorter than the narrowly lanceolate acute sepals. 
Petals obcordate, a third exceeding the sepals. 
It much resembles P. swhjuga, but differs in the prostrate or ascending thicker stems 
and the narrow cyme, the branches of which are not divergent. The terminal leaflets are 
never 5, as is generally the case in P. suhjuga. Following Gray and Watson, I mistook a 
form of P. dissecta, with leaves slightly tomentose beneath for P. rubricaulis of Lehmann. 
I had then seen only a depauperate form of the present species and did not recognize it. 
Tweedy’s specimens from Pike’s Peak, Colorado, answer very well both Lehmann’s de- 
scription and plate. When more material has been received and the species made bet- 
ter known, it may be shown that both P. minutifolia and P. saximontana are forms of 
this species, but at present they seem to be well defined. The following specimens of 
P. rubricaulis have been examined : 
Colorado: F. Tweedy, No. 209, 1896; Patterson, 1876; Alice Eastwood, 1892; S. 
L. Clarke, No. 91, 1895; C. F. Baker; No. 17, 1896; G. E. Osterhout, 1894; No. 12:and 
13, 1897. 
Alberta: J. Macoun, No. 16736, 1897. 
Wyoming: F. Tweedy, No. 205, 1897. 
85. Potentilla minutifolia Rydb. 
Potentilla minutifolia Rydberg, Bull. Torr. Bot. Club, 28: 399. 1896. 
InLtustRatIons: Bull. Torr. Bot. Club, 23: pl. 275, f. 6-10. Puate 42, f. 6; fruit- 
ing hypanthium and calyx, f. 7; dissection of flower, f. 8; pistil, f. 9; stamen, f 10. 
Cespitose ; stems about 1 dm. long, slender, 1—2-leaved, sparingly silky or nearly 
glabrous, slightly striate. Stipules ovate-lanceolate, the lower scarious and brown. Basal 
leaves very small, with slender petioles 3-5 cm. long, sillky-hirsute, shghtly grayish 
beneath, pinnate with two pairs of leaflets, the upper pair and the sessile odd leaflet about 
5 mm. long, the lower pair only 2-8 mm.; leaflets obovate, incised, with oval rounded 
segments. Flowers | or 2, about 15 mm. in diameter. Hypanthium sparingly hirsute, in 
fruit 7-8 mm. in diameter; bractlets oblong, generally obtuse, about half as long as the 
oblong-lanceolate obtuse or acutish sepals. Petals obcordate, about a half longer than 
the sepals. 
This somewhat resembles P. rubricaulis, but differs in the small size of the plant 
and of the leaves, and their short and rounded segments. 
Colorado: Wm. M. Canby (Pike’s Peak) 1895; Osterhout, No. 11, 1897. 
