320 NORTH AMERICAN FLORA [VoLumME 22 
tulose ; bractlets linear-lanceolate, a little shorter than the lanceolate acute sepals, which 
are 5-7 mm. long; petals yellow or somewhat orange, broadly obcordate or obovate and 
emarginate, 6-8 mm. long, exceeding the sepals; stamens about 20; pistils many; styles 
filiform. 
TYPE LOCALITY: Wahatoya Cajion, Spanish Peaks, Colorado. 
DISTRIBUTION : Mountains, valleys, and cafions, from Manitoba to New Mexico, Utah, and 
Athabasca. 
XIII. Longipedunculatae. Perennials, with creeping rootstock and axillary long-ped- 
icelled flowers; otherwise agreeing closely with the GRACILES group. 
64. Potentilla longipedunculata Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 39. 1898. 
Perennial, by a creeping rootstock; stems 4-5 dm. high, ascending, villous with long 
silky white hairs, rather weak, and dichotomously branched, with solitary long-pediceled 
flowers in the axils of the branches; stipules rather large, about 2 cm. long, oblong- 
lanceolate; leaves digitately 3-5-foliolate, slightly silky and green above, densely white- 
tomentose beneath; petioles slender, 4-6 cm. long; leaflets oblanceolate, 3-5 cm. long, 
dissected halfway to the midrib into oblong-lanceolate divergent segments; pedicels sol- 
itary in the axils of the leaves, almost 1 dm. long, slender, silky-villous with spreading 
long hairs; flowers 2 cm. in diameter; sepals and bractlets subequal, oblong-lanceolate, 
almost equaling the broadly cuneate, scarcely at all emarginate, yellow petals; stamens 
about 20; pistils very few; receptacle unusually hairy ; styles filiform but not very slender. 
TYPE LOCALITY: Monmouth, Oregon. 
DISTRIBUTION: Known only from the type locality. 
XIV. Subjugae. This group, as well as the RUBRICAULES, forms the connection between 
the GRACILES on one hand and the Nivzax and the LEUCOPHYLLAx on the other. Thereisa 
combination of digitate and pinnate characters in the leaves. The pinnate tendency is seen 
in the small leaflets on the petiole. The species is in size intermediate between P. gracilis 
or P. filipes and P. nivea,and much resembles depauperate forms of either of the two first 
or an over-developed P. nivea. 
65. Potentilla subjuga Rydb. Bull. Torrey Club 23: 397. 1896. 
Tufted, from a perennial root and cespitose caudex; stems many, 1-3 dm. high, silky- 
villous, few-leaved, rather divergently branched above, the lower portion covered with the 
brown scarious lower stipules; upper stipules green, ovate, entire; basal leaves many, dig- 
itately 5- (seldom 3-) foliolate with an additional pair of smaller leaflets on the petiole, 
about 1 cm. below the others; leaflets 1-4 cm. long, oblong or obovate, deeply incised into 
oblong, rather obtuse segments, silky and green above, silky and white-tomentose beneath; 
stem-leaves generally ternate, few and reduced in size; hypanthium silky-hirsute, in fruit 
5-7 mm. in diameter; bractlets oblong, obtuse or acute, about a third shorter than the tri- 
angular-lanceolate acuminate sepals, which are 5-6 mm. long; petals broadly obcordate, 
exceeding the sepals; stamens about 20; styles filiform, nearly terminal; achenes smooth, 
many. . 
TYPE LOCALITY : Near Empire, Colorado. 
DISTRIBUTION : Mountains of Colorado. 
ILLUSTRATIONS: Bull, Torrey Club 23: £1. 274; Mem. Dep. Bot. Columbia Univ. 2: i. 29. 
XV. Subcoriaceae. Perennial plants, with thick woody rootstocks or caudices, inhabit- 
ing the mountains of Mexico. Leaves mostly basal, green on both sides, digitate, with 5-7 
thick toothed leaflets, dark-green and shining above. Flowers middle-sized, in few-flowered 
cymes. Petals yellow, obcordate. Pistils numerous; styles filiform. 
66. Potentilla subcoriacea Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 63. 1898. 
Stem from a thick perennial rootstock, 3-5 dm. high, strigose-villose and more or less: 
glandular upward ; leaves dark-green and shining, nearly glabrous, thick, and somewhat. 
