310 NORTH AMERICAN FLORA [VoLUME 22 
digitate, with 5-8 broadly oblanceolate leaflets, which are cut more than halfway to the 
midrib into lanceolate-triangular divergent teeth; cyme branched, many-flowered ; sepals 
and bractlets subequal, lanceolate, 6-7 mm. long, almost equaling the bright and rather 
dark-yellow petals; stamens about 30; pistils numerous; styles filiform but short ; achenes 
reticulate. 
TYPE LOCALITY : Italy. 
DISTRIBUTION: Europe and northern Asia; occasionally introduced in Maine, Ontario, and 
New York. 
ILLUSTRATIONS: Fl. Dan. f/. 1820 ; Sturm, Deuts. F1, 91: p/. 5. 
26. Potentilla sulphurea Lam. Fl. Fr. 3: 114. 1778. 
Potentilla recta Willd. Sp. Pl. 2: 1099. 1800. “Not P, recta L,. 1753. 
Potentilla pallida Lag.; Besser, Enum. Pl, Volh. 69. 1822. 
Potentilla recta pallida Lehm. Stirp. Pug. 9: 47. 1851. 
Perennial; stems tall, 4-7 dm. high, strict and leafy, branched above, finely pubescent 
and with scattered long hairs, pale-green; stipules ovate in outline, 1-1.5 cm. long, gener- 
ally pectinately toothed ; lower leaves digitate, of about 7 leaflets, with petioles about 1 dm. 
long, sparingly pubescent and hirsute on both sides, pale-green, strongly veined, the upper 
5-foliolate and short-petioled and the uppermost ternate and sessile; leaflets narrowly ob- 
lanceolate, deeply toothed, with triangular-acute divergent teeth; hypanthium hirsute, in 
fruit 12-15 cm. in diameter; bractlets oblong-lanceolate, about equaling the triangular- 
lanceolate acute sepals, which are 6-8 mm. long; corolla about 20 mm. in diameter; petals 
obovate, deeply emarginate, sulfur-yellow, about 1 cm. long; stamens about 30; pistils 
numerous; styles filiform, but short; achene reticulate when mature. 
TYPE LOCALITY : Mountains of the southern provinces [France]. 
DISTRIBUTION: Native of Europe and northwestern Asia ; sparingly established from Ver- 
mont to the District of Columbia, Illinois, and Michigan. 
ILLUSTRATIONS: Dietr. Fl. Bor. 4: pl. rae Nestler, Monog. Potent. £1. 6 (as P. recia) ; Sturm, 
Deuts, Fl. 91: pl. ¢; Reichenb. Icon. Crit. 4: pi. 339 J 520; Britt. & Brown, Ill. Fl. - 1917 ; 
Mem. Dep. Bot. Columbia Univ. 2: pl. 27, 
VII. Heptaphyllae. Slender perennials. Leaves digitately 5-7-foliolate, with thin, 
green leaflets. Flowers few on long pedicels, middle-sized. Petals obcordate, nearly twice 
as long as the sepals. Pistils many; styles filiform. 
27. Potentilla leptophylla Rydberg, sp. nov. 
Potentilla heptaphylia S, Wats. Proc. Am. Acad. 17: 353; hyponym. 1882.—Rydb. Mem. Dep. 
Bot. Columbia Univ. 2: 62. 1898. Not P. heplaphylia Mill. 1768. 
Perennial; stem slender, 3-4 dm. high, sparingly silky, 1-2 leaved; basal leaves digi- 
ately 5-foliolate ; petioles 1-2 dm. long, slender, sparingly ciliate; leaflets 3-6 cm. long, 
obovate, thin, coarsely serrate, sparingly ciliate on the margins and the veins beneath and 
with scattered hairs above, often petiolulate; stem-leaves much reduced, the lower ternate, 
the upper unifoliolate ; cyme narrow, almost racemiform ; bractlets elliptic, acutish, 4-5 mm. 
long, almost equaling the similar sepals ; petals yellow, obcordate, nearly twice as long as 
the sepals, 8 mm. long; stamens about 25,-with long slender filaments; pistils many; 
styles filiform. 
Type collected in the Caracol Mountains, Coahuila, Mexico, in 1880, Edward Palmer 327 (U. 
S. Nat. Herb. zo. 40223). 
DISTRIBUTION : Known only from the type locality. 
VIII. Nuttallianae. Erect perennials, with short rootstocks or caudices; leaves digitately 
5-9-foliolate or the upper ones 3-foliolate, more or less pubescent, but not tomentose or 
rarely slightly so beneath. Flowers cymose but usually rather few, middle-sized or rarely 
large. Petals obcordate. Stamens about 20. Pistils numerous; styles filiform. Achenes 
smooth. 
28. Potentilla brunnescens Rydb. Bull. Torrey Club 28: 173. 1901. 
A tall strict perennial with short scaly rootstock; stem 4-5 dm. high, tinged especially 
above with brown or purplish, with spreading pubescence; basal leaves digitately 5-7-folio- 
