POTENT I LLA PSEUDORUPESTRIS n. sp.
(?) PotentiIla rupestris Presl, Epim. Bat. 198. 1849. Not L. PotentiIla glandulosa Nevadensis Wats. Bot. Cal. I : 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-cunea.te-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, 8-10 mm. in diameter ; petals white, drying yellowish, broadly obovate, exceeding the sepals by X ; 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. Pupcstris, from which it differs only in the smoother leaves and the longer pubescence of the stern. It differs from the other white-flowered
American species in the open cynic, the slender pedicels and the larger petals, which nearly equal in size those otlissa and glutznosa. It grows in the mountains at an altitude of 2000 to 3000 111. The form growing at lower elevations is more leafy, with larger and glabrate leaflets and less viscid stern ; 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. (altitudes, 6-8000 feet); R. S. Williams, no. 754, 1888.
Idaho : B. W. Evermann, no. 363, 1895 ; J. II. Sandberg, no. 164, 1888 ; J. B. Leiberg, 1890.
California: W. H. Brewer, no. 1714, 1863; Kellogg & Har ford, no. 211, 1868-9.
Irashingion: W. H. Suksdorf, 1885.
Yellowstone National Park T. H. Burglehaus, 1893.
Rocky Ilfountains of British America : Dawson, nos. 7471, 7870, 18734, 1430, 1881; J. Macoun, no. 10474, 1895.