250 



Idaho: A. A. & Gertrude Heller, no. 3230, 1896. 

 Wyoming: T. H. Burglehaus, 1894; E. Stevenson, no. 72, 

 1894. 



Albcrta{?): Macoun, no. 623, 1885 (Kananaskis). 



POTENTILLA PSEUDORUPESTRIS n. sp. 



(?) Potentilla rupestris Presl, Epim. Bot. 198. 1849. Not L. 



Poteiitilla glandulosa Nevadensis Wats. Bot. Cal. i : 178. In 



part. 1 876. 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 orternate 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 

 ^ ; bractlets oblong or lanceolate, much shorter than the ovate 

 lanceolate pointed sepals; stamens about 25; anthers flat, a lit- 

 tle cordate at the base. (Pkte 307.) 



This species is exceedingly similar to the European P. nipestns, 

 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 o\ 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. lactca 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. 



