250 
Idaho: A. A. & Gertrude Heller, no. 3230, 1896. 
Wyomng: T. H. Burglehaus, 1894; E. Stevenson, no. 72, 
1894. 
Alverta(?): Macoun, no. 623, 1885 (Kananaskis). 
POTENTILLA PSEUDORUPESTRIS Nn. sp. 
(?) Potentilla rupestris Presl, Epim. Bot. 198. 1849. Not L. 
Potentilla glandulosa Nevadensis Wats. Bot. Cal. 1: 178. In 
part. 1876. Not P. Nevadensis Boiss. : 
Stem erect, slender, striate, 2~5 dm. high, branched, with slen- 
der ascending branches, sparingly glandular-villous. Stipules 
ovate, more or less toothed. Basal leaves several on rather short 
petioles, pinnate with 3-4 pairs, sparingly and finely pubescent or 
glabrate; terminal leaflet obovate-cuneate-flabelliform, the lat- 
eral ones obliquely elliptical or nearly orbicular, all coarsely ser- 
rate and incised with ovate mucronulate teeth; stem leaves gen- 
erally few, 2-paired or ternate with more rhomboid leaflets ; cyme 
open, with ascending branches and slender pedicels; flowers 
15-20 mm. in diameter; calyx more or less glandular-viscid, vil- 
lous, in fruit not much enlarged, 8-1o mm. in diameter; petals 
white, drying yellowish, broadly obovate, exceeding the sepals by 
¥% ; bractlets oblong or lanceolate, much shorter than the ovate 
lanceolate pointed sepals; stamens about 25; anthers flat, a lit- 
tle cordate at the base. (Plate 307.) 
This species is exceedingly similar to the European P. rupestr7s, 
from which it differs only in the smoother leaves and the longer 
pubescence of the stem. It differs from the other white-flowered 
American species in the open cyme, the slender pedicels and the 
larger petals, which nearly equal in size those of fissa and glutinosa. 
It grows in the mountains at an altitude of 2000 to 3000 m. The 
form growing at lower elevations is more leafy, with larger 
and glabrate leaflets and less viscid stem; this I took for 
P. lactea Greene, but Professor Greene has assured me that it is 
not that plant. In alpine regions it is more glandular viscid and 
with smaller leaflets. The following specimens have been eX- 
amined: 
Montana: Rydberg and J. H. Flodman, Long Baldy, Little Belt 
Mountains, no. 598 (type); Yogo Baldy, no. 499: Spanish Basin, 
nos. 597 and 600; Little Belt Mountains, no. 601 (altitudes, 6-8000 
feet); R. S. Williams, no. 754, 1888. 
Idaho: B. W. Evermann, no. 363, 1895; J. H. Sandberg, no. 
164, 1888; J. B. Leiberg, 1890. 
