Part 4, 1908] ROSACEAE 339 
130. Potentilla proxima Rydberg, sp. nov. 
Perennial, with a short caudex; stems less than 1 dm. high, decumbent or ascend- 
ing, grayish silky-strigose; basal leaves pinnate with usually 7 approximate leaflets; 
petioles 1-2 cm. long, silky-strigose ; leaflets 7-15 mm. long, obovate, serrate with lance- 
ovate teeth, silky on both sides and white-tomentose beneath; stem-leaves few; the lower 
5-foliolate, the upper 1-3-foliolate ; stipules lanceolate, about 1 cm. long; cymes 4~7-flow- 
ered; hypanthium silky, in fruit 6 mm. broad; bractlets linear-lanceolate; sepals lanceo- 
late; both about 4 mm. long; petals obcordate, 5 mm. long; stamens 20; styles filiform. 
Type collected on the divide between Sevier and Beaver Rivers, south of Belknap Peak, Utah, 
in 1905, Rydberg G’ Carlion 7369 (herb. N. Y. Bot. Gard.). 
DISTRIBUTION : Mountains of south central Utah to Arizona. 
131. Potentilla luteosericea Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 101. 1898. 
Perennia], with a thick deep root and a short eréct caudex; stems several, decumbent 
or prostrate, 0.5-2 dm. long, few-leaved, yellowish-silky ; basal leaves pinnate, with 3-5 
approximate leaflets, densely yellowish silky-canescent on both sides; leaflets cuneate 
or obovate, entire at the base, 3-7-toothed toward the apex; hypanthium yellowish-silky, 
about 5 mm. in diameter; bractlets ovate, obtuse, a little shorter than the ovate-lanceolate 
acutish sepals; petals obcordate, light-yellow, exceeding the sepals by about a third. 
TYPE LOCALITY: San Pedro Martin, Lower California. 
DISTRIBUTION : Known only from the type locality. 
XXVIII. Candicantes. Low cespitose perennials with thick woody caudex. Leaves 
numerous, pinnate. Leaflets finely dissected, silvery-canescent. Petals yellow, obcor- 
date. Styles filiform. 
132. Potentilla candicans Humb. & Bonpl.; Schlecht. Ges. Nat. 
Freunde Berlin Mag. 7: 285. 1815. 
Potentilla candicans nana Humb. & Bonpl.; Nestler, Monog. Potent. 34. 1816. 
Potentilla Humboldtiana Tratt. Ros. Monog. 4: 41. 1824. 
Potentilla lineariloba Seringe, in DC. Prodr. 2: 582. 1825. 
Potentilla candicans crocea Lehm. Rev. Potent. 32. 1856. 
Perennial, with a thick ligneous root and short caudex; stem from 0.5 to 3 dm. high, 
with few reduced leaves, more or less white-silky; basal leaves numerous, silvery-white, 
pinnate, with 6-10 pairs of deeply dissected leaflets; segments narrowly linear and more 
or less revolute; bractlets oblong, about half as long as the ovate or broadly lanceolate 
sepals, which are about 5mm. long; petals yellow or (in var. crocea) orange, broadly obcor- 
date, a little exceeding the sepals; style filiform. 
TYPE LOCALITY : Tianguillo, between Mexico and Toluca. 
DISTRIBUTION : Central Mexico. : 
ILLUSTRATIONS : Nestler, Monog. Potent. A/. 3, f. 2; pl. 4, f. 2 (war nana); Moc. & Sessé, 
Calq. Dess. p/. 298 (as P. lineartloba). 
XXIX, Leucophyliae. Rather stout perennials. Leaves pinnate, with 5-13 leaflets, 
grayish- or whitish-silky, villous or tomentose, especially beneath, coarsely toothed but not 
dissected. Petals obcordate, longer than the sepals. Stamens about 20. Pistils sometimes 
few; styles filiform. 
133. Potentilla coloradensis Rydb. Mem. Dep. Bot. Columbia 
Univ. 2: 115. + 1898. 
Stems several from the perennial caudex, rather slender, silky-tomentose, in age gla- 
brate, about 3 dm. high, branched ; lower stipules scarious and brown, covering the caudex, 
the upper lanceolate, entire; basal leaves interruptedly and irregularly pinnate, leaflets 
9-13, finely tomentose, or in age more glabrate ; stem-leaves mostly ternate, or the upper 
simple; leaflets cuneate-oblanceolate, incisely serrate with triangular acute teeth ; cyme 
branched, with ascending branches ; hypanthium tomentose, in fruit 4-5 mm. in diameter ; 
bractlets linear-lanceolate, scarcely half as long as the narrowly lanceolate acuminate sepals, 
