128 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Horkdia Michcneri Rydb. Bull. Torr. Bot. Club, 25 : 54. 1898. 



Illustrations: Plate 55, /. i-^; dissection of flower, /. 5 ; pistil,/. 4; stamens, /. 5; 

 fruiting hypanthium and calyx, /. 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 cm. 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 Avidely separated stations. 



California: Michener ; Michener cfe Bioletti, 1892; Greene; T. S. Brand egee, 1886; 

 Alice Eastwood, 1896 (Mt. Tamalpais); W. H. Shockley, No. 596, 1888 (White 

 Mts., Mono Co.). 



5. Horkelia sericea (Gray) Rydb. 



Horkdia Califontica var. sericea Gray, Proc. Am. Acad. 6 : 529. 1805. 



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 Califoriiim \ar. sericea K. Brandegee, Zoe, 2: 349. 1891. 



Horkdia sericea Rydb. Bull. Torr. Bot. Club, 25 : 56. 1898. 



Illustrations: Plate 60, f. 1-2; dissection of flower,/. 3; stamens,/. 4.; fruiting 

 hypanthium and calyx,/ 5; pistil, /. 6. 



Stem stout, 3-6 dm. high, ascending, or rarely nearly prostrate, silky-pubescent, not 

 glandular. Stipules ovate or lanceolate, 1-2 cm. 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. 



