Parr 3, 1908] ROSACEAE 285 
Perennial, with a deep and thick root, crowned by a short erect caudex covered with 
brown-hairy scales; stems erect or ascending, 2-4 dm. high, finely villous, more or less 
leafy, dichotomously branched; stipules lanceolate; leaves numerous, grayish or white, 
silky-villous, pinnate with very numerous, crowded and somewhat imbricate leaflets, these 
generally less than 5 mm. long, 2-4-cleft to the base into oblong-oval segments; cyme at 
first dense, in age open, dichotomously branched, but with nearly sessile flowers; hypan- 
thium cup-shaped or turbinate, villous, in age 4 mm. in diameter; bractlets linear-lanceo- 
late, about a third shorter than the broadly lanceolate acuminate sepais, which are 3-4 mm. 
long; petals yellow, spatulate, a little exceeding the sepals, rounded at the apex; stamens 
20; filaments filiform. 
TYPE LOCALITY: Probably at Sacramento, California. 
DISTRIBUTION : Central California. 
ILLUSTRATIONS: Bot. U.S. Expl. Exp. p/. 4; Mem. Dep. Bot. Columbia Univ. 2: f/. 86. 
4, Ivesia unguiculata A. Gray, Proc. Am. Acad. 7: 339. 1868. 
Potenitilla unguiculata Greene, Pittonial: 105. 1887. 
Potentilla ciliata Greene, Pittonia 1: 103. 1887. 
Horkelia unguiculata Rydb. Mem. Dep. Bot. Columbia Univ. 2: 146. 1898. 
Perennial, with a deep and thick root, crowned with a short, erect scaly caudex; stems 
several, more or less brown, sparingly silky-villous, simple, ascending or decumbent, 3-4 
dm. high; stipules pectinately divided, rather large; basal leaves numerous, somewhat 
grayish but not densely silky with long hairs, pinnate, with numerous crowded pairs of 
leaflets, these 5-7.5 mm. long, divided to the base into linear-oblong or linear acute seg- 
ments; cyme dense, subcapitate; hypanthium cupulate, slightly silky, 4 mm. in diameter ; 
bractlets lanceolate, slightly shorter than the broadly lanceolate sepals, which are 2-3 mm. 
long; petals white, broadly spatulate or obovate, exceeding the sepals; stamens 10-15; 
filaments filiform. 
TYPE LOCALITY : Westfall’s Meadow, Yosemite Valley, California. 
DISTRIBUTION : Southern Sierra Nevada, California. 
ILLUSTRATION: Mem. Dep. Bot. Columbia Univ. 2: i. 87. 
5. Ivesia campestris (M. E. Jones) Rydberg. 
Potentilla utahensis campestris M. E. Jones, Proc. Calif. Acad. IT. 5: 679. 1895. 
Ivesia utahensis campestris M. E. Jones, Proc. Calif. Acad. II. 5: 679. 1895. 
Horkelia campestris Rydb. Mem. Dep. Bot. Columbia Univ. 2: 147, 1898. 
Perennial, with a rather slender root; stems several, decumbent or prostrate, more or 
less tinged with red, somewhat silky-villous, less than 2 dm. long; stipules lanceolate ; basal 
leaves numerous, less than 5 cm. long, pinnate, with many rather approximate leaflets, 
more or less silky-hirsute ; leaflets about 5 mm, long, divided to the base into linear-oblong 
segments; stem-leaves few and smaller; cyme branched, the branches with subcapitate 
clusters; hypanthium cupulate or saucer-shaped, nearly glabrous; bractlets linear, much 
smaller than the lanceolate-triangular sepals, which are 2 mm. long; petals yellow, spatu- 
late, a little exceeding the sepals; stamens 20; filaments filiform, rather short. 
TYPE LOCALITY: Whitney Meadows, Sierra Nevada Mountains, California. 
DISTRIBUTION : Known only from the type locality. 
ILLUSTRATION : Mem. Dep. Bot. Columbia Univ. 2: p/. 88, f. 1-4. 
6. Ivesia mollis (Eastw.) Rydberg. 
Horkelia mollis Eastw. Bot. Gaz. 41: 286. 1906. 
Perennial, with a thick scaly caudex; stems several, ascending, red-purple, villous 
with fine silky hairs, about 2 dm. high; basal leaves 6-10 cm. long; leaflets crowded, 
deeply divided into linear-spatulate divisions, 3-4 mm. long, finely villous; stipules 
adnate, the free portion filiform-attenuate, 4 mm. long; cauline leaves similar but 
reduced ; stipules incised; flowers in a corymbiform or capitate cyme; hypanthium cam- 
panulate, 5 mm. long; bractlets linear, about as long as the subulate-lanceolate sepals ; 
petals yellow, clawed; blades broadly spatulate, 1 mm. wide; stamens 15; pistils 5-20 ; 
style slightly thickened at the base. 
Type LOCALITY : Hockett’s Meadows, Tulare County, California. 
DISTRIBUTION: Type locality and vicinity. 
