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 Gracilis 
group, especially P. fastigiata in size and P. pulcherrima 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. subjuga, digitately 5-foliolate with a pair of smaller ones 
some distance below. InP. sudjuga, 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. zévea, 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. S. 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, genet 
ally tinged with red, 1-1%4 dm. high, sparingly strigose ; stipules 
linear, lanceolate, acuminate, about 1 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 alittle grayish tomentulose beneath; 
leaflets obovate or oblanceolate in outline, divided to near the mid- 
rib into linear acute segments; flowers on slender pedicels, nearly 
1 cm. in diameter; calyx silky-strigose, in fruit 14 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 29; style filiform, nearly terminal ; achenes smooth. 
(Plate 275, figs. 1-5). a 
It resembles a very slender form of the preceding, but the ter- 
minal leaflets, as in the two next, are always only three. The ses 
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: ue 
~ lets and more erect branches. 
* 
