398 



leaves generally ternate, few and reduced in size ; calyx silky-hir- 

 sute, in fruit 5-8 mm. in diameter ; bractlets oblong, obtuse or . 

 acute, about }4, shorter than the ovate triangular acuminate sepals; 

 petals broadly obcordate exceeding the sepals; stamens about 

 20 ; style filiform, nearly terminal ; achenes smooth. (Plate 274.) 



As before noted it resembles somewhat the species of the Gmd/is 

 group, especially P.fastigiata in size and P. pulcherriina in the form 

 of the leaflets and the pubescence. The latter has digitate or more 

 or less pinnate leaves with approximate leaflets, but they are never, 

 as in P. siibjitga, digitately 5-foliolate with a pair of smaller ones 

 some distance below. In P. subjiiga, the leaflets are more deeply 

 incised and the stem and branches stricter and the latter rather di- 

 vergent ; they are few-flowered,* as in P. nivca, from which it differs 

 in the number of the leaflets. 



Colorado: N. H. Patterson, no. 192, 1892 (from near Empire, 

 type); 1885 (from Gray's Peak); C. 5. Crandall, no. 184, 1892 

 (from Graymont); T. C. Porter, no. 44; Hall and Harbour, no. 

 160, 1862, mainly. 



POTENTILLA TENERRIMA n. Sp. 



Tufted from a perennial root; stems many, very slender, gener- 

 ally tinged with red, i-i>^ dm. high, sparingly strigose ; stipules 

 linear, lanceolate, acuminate, about i cm. long, the lower scarious 

 and brown. Leaves digitately 3-foliolate, with a pair of smaller leaf- 

 lets below, or, which is the same, pinnate of 2 pairs and terminal 

 leaflet sessile, finely silky and a little grayish tomentulose beneath ; 

 leaflets obovate or oblanceolate in outline, divided to near the mid- 

 rib into linear acute segments; flowers on slender pedicels, nearly 

 I cm. in diameter; calyx silky-strigose, in fruit ^2 cm. in diameter; 

 bractlets linear, acute, very little shorter than the narrowly lanceolate 

 sepals ; petals obovate, slightly retuse, a little exceeding the sepals ; 

 stamens about 2 D ; style filiform, nearly terminal ; achenes smooth. 

 (Plate 275, figs. 1-5). 



It resembles a very slender form of the preceding, but the ter- 

 minal leaflets, as in the two next, are always only three. The seg- 

 ments of the leaflets are also much narrower, as also the bracts and 

 sepals, which are narrower than in any other North American 



species. 



Colorado: Brandegee, no. 950, 1874 (from Bergen's Park, type); 

 Hall and Harbour, no. 160 (in part, in the Harvard herbarium). 



* P. rubricaulis Lehm. may perhaps be a form of this with only 3 terminal leaf- 

 lets and more erect branches. 



