Part 4, 1908] ROSACEAE 351 
the veins beneath, deeply cleft into lanceolate or linear divisions with revolute margins; 
stem-leaves similar but smaller and short-petioled; inflorescence congested; bractlets 
lanceolate, obtusish, 3-4 mm. long, almost equaling the lance-ovate sepals; petals broadly 
obovate, emarginate, 4-5 mm. long; stamens about 20; pistils numerous; styles thickened 
and glandular at the base. 
TYPE LOCALITY : Valley of Santa Fé, New Mexico. 
DISTRIBUTION: Dry plains and hills from New Mexico and Arizona to Montana. 
174. Potentilla atrovirens Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 95. 1898. 
Perennial, with a stout cespitose caudex; stem stout, 2-3 dm. high, with erect 
branches, dark-colored, densely pilose; leaves very dark-green, densely pilose on both 
sides, strongly veined, pinnate, with 7-9 leaflets; these obovate to oblanceolate, coarsely 
dissected about halfway to the midrib into oblong segments; cyme narrow, many-flowered, 
with erect branches; hypanthium densely pilose, about 8 mm. in diameter when fully devel- 
oped; sepals and bractlets subequal, about 5 mm. long, ovate, exceeded by the cuneate- 
obovate bright-yellow petals; stamens about 20, short; pistils very numerous; style short, 
fusiform. 
TYPE LOCALITY: Douglas Creek, Wyoming. 
DISTRIBUTION : Minnesota to Wyoming and Colorado. 
175. Potentilla strigosa Pall.; Pursh, Fl. Am. Sept. 356, as synonym. 
1814. — Tratt. Ros. Monog. 4: 31. 1824. 
Potentilla pennsylvanica strigosa Pursh, Fl. Am. Sept. 356. 1814. 
Potentilla pectinata Fisch.; Hook. Fl. Bor. Am. 1: 188, assynonym. 1833. 
Potentilla absinthiifolia Dougl.; Lehm. Stirp. Pug. 9: 41. 1851. 
Potentilla rubricaulis Dougl.; Lehm. Rev. Potent. 58. 1856. Not P. rubricaulis Lehm. 1830. 
Perennial, with a short cespitose caudex; stems 1-4 dm. high, densely puberulent and 
with long spreading hairs, yellowish, often tinged with red; basal leaves pinnate, with 7-11 
leaflets; petioles 3-7 cm. long, also puberulent and hirsute with spreading hairs; leaflets 
obovate or oblanceolate, 1-5 cm. long, densely silky-pubescent but yellowish-green above, 
densely grayish-tomentose and silky beneath, deeply cleft into lanceolate or linear, revolute 
_ divisions; stipules ovate, 1.5-2 cm. long, usually deeply cleft, acuminate; inflorescence 
dense; hypanthium villous, in fruit 6-7 mm. broad; bractlets lanceolate, 4-5 mm. long; 
sepals ovate, slightly longer, strongly ribbed; petals obovate or orbicular, about equaling 
the sepals; stamens 20; pistils numerous; styles thickened and glandular at the base. ~ 
TYPE LOCALITY: On the Missouri. . 2 . 
DISTRIBUTION : Plains from Hudson Bay to Kansas, New Mexico, and British Columbia ; also 
northern Asia, according to Lehmann. . 2 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: Al. 38, f. 2-6. 
176. Potentilla lasiodonta Rydberg, sp. nov. 
Perennial ; stem strict, 3-4 dm. high, more or less tinged with red, densely pubescent 
with short spreading pubescence; basal leaves pinnate, with 11-15 leaflets; petioles 4-6 
cm. long, densely short-pubescent with spreading hairs; leaflets oblong, 14 cm. long, 
green and densely short-pubescent, almost velvety above, grayish-tomentose beneath, 
deeply serrate with 8-21 lanceolate or linear-lanceolate teeth strongly directed forward; 
stem-leaves similar, but short-petioled and with less numerous leaflets ; stipules lanceolate, 
about 2 cm. long, with linear-subulate teeth; inflorescence congested, the flowers almost 
sessile ; hypanthium velvety-villous ; bractlets lanceolate ; sepals ovate ; both acute, strongly 
ribbed, subequal in length, about 6 mm. long; petals rounded-obovate, slightly if at all 
exceeding the sepals; styles thickened and glandular below. 
Type collected near Calgary, Alberta, in 1897, John Macoun 16716 (herb, N. Y. Bot. Gard.). 
DISTRIBUTION: Saskatchewan to South Dakota and Alberta. 
DOUBTFUL AND EXCLUDED SPECIES 
Potentilla dissecta Pursh, Fl. Am. Sept. 355. 1814. This is described as being gla- 
brous, with quinate leaves and pinnatifid leaflets, and was collected near Hudson Bay. No 
