MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 13 
cymes, small and simple, incised, shorter than the flower-cluster. Hypanthium cup- 
shaped, about 4 mm. in diameter, glandular-hirsute; bractlets linear, much shorter 
than the lanceolate-triangular sepals. Petals cuneate, slightly emarginate, 3-4 mm. long 
and 4 mm. wide. 
It is less common than the preceding species, but extends farther north. 
Californa: J. G. Lemmon, No. 1043, 1874; 1875; T. 8. Brandegee, 1892; Mrs. R. 
M. Austin, 1882. 
Washington: T. J. Howell, 1880; No. 206, 1881; 1882; F. Liddeke; W. A. Suks- 
dorf, No. 33, 1881. , 
Oregon: J. & T. J. Howell, No. 294. 1880. 
1g. Horkelia tenuiloba (Torr.) Gray. 
Horkelia fusca var. tenwiloba Torr. Pac. R. R. Rep. 4: 84. 1857. 
Horkelia tenwiloba Gray, Proc. Am. Acad. 6: 519. 1865. 
Brewer & Wats. Bot. Cal. 1: 182; Wats. King’s Rep. 5: 448; Regel, Act. Hort. 
Petr. 1: 153. 
Potentilla tenwiloba Greene, Pittonia, 1: 105. 1887. 
Greene, F]. Fran. 1: 67; Man. Bay Reg. Bot. 116. 
Potentilla stenoloba Greene, Erythea, 3: 36. 1895. 
IuLustRATIoNS: PLATE 73, f. 1-2; dissection of flower, f. 3; pistil, f. 4; stamens, f. 
5; fruiting hypanthium and calyx, f. 6. 
Stems 1-2 dm, high from a perennial branched and often horizontal caudex, more 
or less tinged with brown, hirsute-villous, not at all glandular, mostly simple. Stipules 
ovate-lanceolate, often pectinately toothed. Basal leaves numerous, pinnate; more or 
less grayish hirsute ; leaflets 6-10 pairs, about 1 cm. long, divided almost to the base into 
linear segments. Stem leaves similar but smaller. Cyme dense, often nearly subcapitate. 
Hypanthium cupulate, about 5 mm. in diameter, hirsute; bractlets lanceolate, much 
smaller than the broadly lanceolate sepals. Petals oblong, very little exceeding the sepals. 
This species belongs to the Coast Range of California, and is a rather rare plant. 
The following specimens have been examined : 
California: Bigelow (Whipple Exp.) 1853-4; G. R. Vasey, No. 165, 1880; Mrs. 
Curran, 1885. 
$4. TRIDENTATAE. 
20. Horkelia tridentata Torr. 
Horkelia tridentata Torr. Pac. R. R. Rep. 4: 84. 1857. 
Gray, Proc. Am. Acad. 6: 580; Brewer & Wats. Bot. Cal. 1: 182; Rattan, An. Key 
W. Coast Bot. 52; Rothrock, Rep. U.S. Geogr. Surv. 4: 360; Regel, Act. Hort. Pet. 1: 
152; Howell, Fl. N. W. Am. 1: 181. 
