Part 4, 1908] ROSACEAE 321 
coriaceous, digitate, with 5-7 broadly obovate-cuneate crenate leaflets 3-5 cm. long; in- 
florescence open, few-flowered; bractlets linear-lanceolate, shorter than the lanceolate 
sepals; petals yellow, broadly obcordate, 8 mm. long, light-yellow, one half longer than the 
sepals. 
TYPE LOCALITY: [Sierra de las Cruces,] Mexico. 
DISTRIBUTION: Known only from the type locality. 
67. Potentilla ranunculoides Humb. & Bonpl.; Nestler, Monog. 
Potent. 56. 1816. 
? Potenitlla macrorhiza Willd.; Schlecht. Ges. Nat. Freunde Berlin Mag. 7: 292. 1815. 
Perennial, with a short woody rootstock; stem short, 1-2 dm. high, erect, few-leaved and 
few-flowered, slightly silky-strigose ; basal leaves digitately 5-7-foliolate; stem-leaves small, 
ternate, all glabrous except on the veins and the margins; petioles 1-3 cm. long, with 
rather appressed pubescence; leaflets rounded-obovate, thick, strongly veined, crenate 
above the middle, 1-2 cm. long; bractlets oblong, obtuse, 2-3 mm. long, about half as long 
as the lanceolate acuminate strigose sepals ; petals obcordate, 5-7 mm. long; stamens about 
20; pistils rather few ; styles filiform. 
TYPE LOCALITY: Cerro de las Cruces, Mexico. 
DISTRIBUTION : Mountains of central Mexico. 
ILLUSTRATION: Nestler, Monog. Potent. f/.3, f. 2. 
68. Potentilla Rydbergiana Rose, Contr. U. S. Nat. 
Herb. 8: 30. 1903. 
Perennial, with a thick, woody, cespitose caudex ; stem ascending, hirsute, less than 1 
dm. high, with 1-3 reduced leaves; basal leaves digitately 5-foliolate; petioles 1-3 cm. 
long, hirsute; leaflets obovate or elliptic-obovate, 1-2 cm. long, coarsely toothed with 
rounded-ovate teeth, glabrous above and with scattered long hairs beneath, thick; stipules 
lanceolate, entire; hypanthium hemispheric, hirsute, in fruit 6-7 mm. wide; bractlets ob- 
long, rounded at the apex, about 4 mm. long, glabrous or sparingly granuliferous; sepals 
lanceolate, acute, 5 mm. long, glabrous or granuliferous; petals obovate, 8-10 mm. long, 
bright-yellow, retuse; stamens 20-25; pistils rather few; styles filiform. 
TYPE LOCALITY: Mountains above Pachuca, Hidalgo. 
DISTRIBUTION: Type locality and vicinity. 
ILLUSTRATION: Contr. U. S. Nat. Herb. 8: pi. 4. 
XVI. Obovatifoliae. Perennials, with thick woody rootstocks. Stems decumbent at the 
base, with few reduced leaves. Leaves digitately 5-7-foliolate, thick, dark-green and pu- 
bescent above, white-tomentose beneath. Flowers few, cymose. Petals yellow. Stamens 
2040. Pistils numerous; styles filiform. 
69. Potentilla staminea Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 67. 1898. 
Perennial, with a thick tap-root; stem stout, 4-6 dm. high, leafy, more or less villous- 
tomentose; basal leaves digitate with 5~7 leaflets, hairy but green above, densely white- 
tomentose and silky beneath; petioles densely woolly, about 3-10 cm. long; leaflets 
obovate, 3-10 cm. long, coarsely crenate-serrate; stem-leaves 3-5-foliolate, short-petioled 
or sessile; stipules ovate, toothed, 1-1.5 cm. long; cyme open, with long pedicels; hypan- 
thium villous, in fruit 8 mm. broad; bractlets oblong or lanceolate, about 5 mm. long ; 
sepals ovate-lanceolate, 7-8 mm. long, acuminate; corolla 2.5-3 cm. in diameter; petals 
yellow, broadly obcordate, nearly twice as long as the sepals; stamens about 40; styles 
filiform ; pistils many. 
TYPE LOCALITY: Southern Mexico. 
DISTRIBUTION : Southern Mexico and Guatemala. 
70. Potentilla obovatifolia Rydb. Bull. Torrey Club 28: 175. 1901. 
A low perennial, with a thick tap-root ; stems ascending or decumbent, 2-3-leaved, 1.5-2 
dm. high, sparingly villous ; basal leaves mostly digitately 7-foliolate, with petioles 3-10 cm. 
