36 SYNOPSIS OF THE FLORA OF COLORADO. 



all its parts, with 11 leaflets and bright yellow flowers, from Ute Pass, 

 Porter. Gray's Peak, Dr. Smith. Saint Vrain Canon, Coulter. 



POTENTILLA GLANDULOSA, Lincll., (P. fissa, Kutt.) WaUorts Rev., I. c., 

 p. 552. More slender and branched than the former, l-2 high, less 

 pubescent; leaflets 5-9, V long or less; cyme paiiicled with elongated 

 branches and more slender pedicels; flowers often smaller; calyx less 

 tomentose; bractlets linear; petals yellow, sometimes white; stamens 

 20-25. Colorado, fide Watson, I c. 



POTENTILLA NoRVEGiCA, L. Watson's Rev.. 1. c., p. 552. Gray's Man- 

 ual, p. 154. Denver, Dr. Smith; B. II. Smith.' Caiiou City, Brandcaee. 

 Monument Park, Coulter. 



POTENTILLA RIVALIS, Nutt. Watson's Rev., I c., p. 552. More slender 

 than the former, diffusely branched even from the base; pubescence 

 softly villous; stipules lanceolate to ovate; leaves pinnate with 2 pairs 

 of closely approximate leaflets, or a single pair and the terminal leaflet 

 3-parted ; the upper leaves ternate; leaflets ovate or oblong-cuneate or 

 lanceolate, I'-IJ 7 long, more or less incised-serrate; cymes loose, less 

 leafy, with slender pedicels; bractlets and sepals equal, lJ"-3" long; 

 petals minute; stamens 10-20; achenia usually smooth; receptacle short. 



Var. MILLEGRANA, Watson. (P. miUegrana, Eng.) . Leaves all ter- 

 nate; steins erect or weak and ascending; achenia often small and light- 

 colored. Colorado, fide Watson in King's Report. 



POTENTILLA PENNSYLVANIA, L., var. STRIGOSA, Pursh. Watson's 

 Rer., I. c., p. 554. Low, 6'-15' high ; stems erect, leafy, rather stout ; leaves 

 mostly tomentose on both surfaces, paler beneath, deeply pectinate- 

 divided or pimiatind, segments linear, entire, with revolute margins; 

 stipules laciniate. Hall & Harbour, 162; Porter. Canon City, Brandegee. 

 Horse Shoe Mountain near Fairplay, Coulter. 



POTENTILLA HIPPIANA, Lehm. (P. Pennsylvania, L., var. Hlppiana, 

 T. & G. Fl. N. Am.) Watson's Rev., 1. c., p. 555. Densely white tomentose 

 and silky throughout; the upper surface of the leaves a little darker; 

 stems ascending, l -!^ high, slender, branching above into a diffuse 

 cyme; stipules usually entire; leaves pinnate, occasionally digitate; 

 leaflets 5-11, cuneate-oblong, l'-2' long, obtuse, incisely-toothed, at 

 least towards the apex, margins not revolute; pedicels slender; bract- 

 lets narrow; petals 2.J"-3J" long, exceeding the calyx; styles filiform, not 

 glandular at base, terminal; carpels 10-30. Hall & Harbour, 158. Near 

 Denver, Dr. Smith; Canby. Colorado Springs, Porter. Canon City, 

 Brandegee. Ute Pass and Twin Lakes, Coulter. 



POTENTILLA EFFUSA, Dougl. Watson's Rev., I. c., p. 555. Canescently 

 tomeutose with scattered villous hairs; stems ascending, diffusely 

 branched above, 4 / -12 / high ; stipules lanceolate, entire or incised ; 

 leaflets 5-11, interruptedly pinnate, the alternate ones often smaller, 

 c-uneate-oblong, coarsely incised-serrate or dentate, the smaller leaflets 

 3-5 toothed ; pedicels slender ; sepals and the much smaller bractlets 

 acuminate, 2 // -3 // long, equaling or exceeding the obcordate petals ; 

 carpels 10. South Park, Porter. 



POTENTILLA PLATTENSIS, Nutt. Watson's Rev., I. c., p. 556. Clothed 

 with a minute appressed pubescence; stems 6' high, weak, decumbent; 

 radical leaves pinnately 7-13 foliolate, cauline 3-5 foliolate: leaflets 

 cuneiform, deeply pinnatind-incised; the segments 3-7, oblong or 

 linear; stipules large, broadly ovate or lanceolate, entire, panicle few- 

 flowered; pedicels slender, elongated; petals obcordate, '2" -3" long, 

 a little longer than the acuminate calyx-segments. Common in wet 



