249 
M. trifida, which also has 3-cleft petals, it can scarcely be con- 
fused, as that species has reniform leaves, larger flowers, and the 
segments of the petals are filiform. 
Type: J. H. Flodman, no. 527, Spanish Basin in the Madi- 
son Range, Montana, July, 11, 1896, altitude 6000 ft. 
POTENTILLA CANDIDA Rydberg, Bull. Torr. Club, 24: 6. 1896. 
A few specimens of this species were collected by me in 1895, 
at Deer Lodge, no. 2688, and at Lima, no. 2687. 
POTENTILLA CONVALLARIA N. Sp. 
_ Stem tall, erect, 4~10 dm. high, long-villous but not very dyensel _ 
So, glandular or viscid, especially above, branched above with 
long erect branches. Stipules ovate or lanceolate, more or less 
toothed, about I cm. long; basal leaves several, with villous 
petioles 5-10 cm. long, pinnate of 4-5 pairs, glabrate or slightly 
pubescent ; leaflets 2-5 cm. long, broadly obovate and obtuse, 
Coarsely serrate and incised with ovate teeth; stem leaves with 
fewer more acutish leaflets ; cyme with rather elongated upright 
branches, but with short pedicels, and therefore rather elongated 
and narrow; flowers 10-18 mm. in diameter; calyx densely 
glandular-viscid, villous, not much enlarged in fruit, 8-10 mm. in 
diameter ; petals broadly obovate, white, in drying turning yellow, 
a little longer than the sepals; bractlets lanceolate, much smaller 
than the ovate-lanceolate sepals; stamens about 25, anthers flat, 
slightly cordate at the base. (Plate 306.) 
This species resembles P. arguta, but is more slender. The 
branches of the cyme are rather elongated, the calyx smaller, the 
Stamens fewer and the leaflets rounder and nearly glabrous. 
The leaves most resemble those of P. glutinosa, from which the 
Plant differs mostly in its smaller and white petals and in the nar- 
Tow cyme. It has been labelled Potentilla arguta whenever col- 
lected. It is apparently a rather rare plant, representing that 
Species in the valleys of the northern Rockies. The following 
specimens have been examined: 
Montana: Rydberg and J. H. Flodman, no. 602, in the Elk 
Mountains ; no. 603 in the Spanish Basin; no. 604 (type) near 
Bozeman; no. 605 in the Bridger Mountains, all in 1896. F. L.— 
Scribner, no. 42, 1883. : 
Washington: Wilkes Exp. no. 817; C. V. Piper, no. 1528, — 
Assiniboia: J. Macoun, no. 41, 1880.(?) hes 
