128 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
Horkelia Micheneri Rydb. Bull. Torr. Bot. Club, 25: 54. 1898. 
InLusrrations: PLATE 59, f. 1-2; dissection of flower, f. 3; pistil, f 4; stamens, jp Ds 
fruiting hypanthium and calyx, f. 6. 
Stems several from a deep perennial root, slightly hirsute, brown, simple below, 
ascending or erect. Stipules lanceolate, mostly entire, 5-10 mm. long. Basal leaves nu- 
merous, slightly pubescent or glabrate, dark green, pinnate, with 10-16 pairs of cuneate 
leaflets about 1 em. long, these flabelliform, dissected from the end to the middle into 2-4 
segments, these again divided into rather divergent oblong, obtuse lobes. Stem leaves 
similar, but smaller and with fewer leaflets. Cyme open with divergent branches. 
Hypanthium hirsute, cupulate, in fruit 4-5 mm. in diameter; bractlets linear-lanceolate, 
much smaller than the broadly lanceolate sepals. Petals yellowish, spatulate, a little 
exceeding the sepals. 
A comparatively rare mountain plant collected at two widely separated stations. 
California: Michener ; Michener & Bioletti, 1892; Greene; T. 5. Brandegee, 1886; 
Alice Eastwood, 1896 (Mt. Tamalpais); W. H. Shockley, No. 596, 1888 (White 
Mts., Mono Co.). 
5. Horkelia sericea (Gray) Rydb. 
Horkelia Californica vay. sericea Gray, Proc. Am. Acad. 6: 529. 1865. 
Brewer & Wats: Bot. Cal. 1: 181; Regel, Act. Hort. Petr. 1: 151; Rattan, An. 
Key W. Coast Bot. 52. 
Horkelia Kelloggii Greene, Bull. Cal. Acad. 2: 416. 1887. 
Behr, Fl. Vic. San Fran. 249. 
Potentilla Kelloggii Greene, Pittonia, 1: 101. 1887. 
Greene, Fl. Fran. 1: 66; Man. Bay Reg. Bot. 116. 
Potentilla Californica var. sericea Kk. Brandegee, Zoe, 2: 349. 1891. 
Horkelia sericea Rydb. Bull. Torr. Bot. Club, 25: 56. 1898. 
Intustrations: PLate 60, f. 1-2; dissection of flower, f. 3; stamens, f. 4; fruiting 
hypanthium and calyx, f. 5; pistil, f. 6. 
Stem stout, 3-6 dm. high, ascending, or rarely nearly prostrate, silky-pubescent, not 
elandular. Stipules ovate or lanceolate, 1-2 em. long, often toothed. Basal leaves nu- 
merous, rather short-petioled, pinnate; leaflets 4-7 pairs, rather thick and with promi- 
nent veins, densely and finely silky-canescent, obovate, 1-2.5 cm. long, coarsely 
toothed, the upper confluent. Stem leaves similar but smaller, of 2-5 pairs. Cyme 
rather dense. Hypanthium densely silky-canescent, cupulate, about twice as wide as 
deep; bractlets and sepals entire, ovate or lance-ovate, nearly of the same length. 
Petals white, spatulate, 5-6 mm. long. 
