MEMOIES FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 137 



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. 



California: J. G. Lemmon, No. 1043, 1874; 1875; T. S. Brandegee, 1892; Mrs. K 

 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. 



ig. Horkelia tenuiloba (Torr.) Gray. 



Horkelia fusca var. tenuiloba Torr. Pac. R. R. Rep. 4 : 84. 1857. 



Horkelia tenuiloba Gray, Proc. Am. Acad. 6: 519. 1865. 



Brewer & Wats. Bot. Gal. 1: 182; Wats. King's Rep. 5: 448; Regel, Act. Hort. 

 Petr. 1: 153. 



Potentilla tenuiloba Greene, Pittonia, 1 : 105. 1887. 



Greene, Fl. Fran. 1 : 67; Man. Bay Reg. Bot. 116. 



Potentilla stenoloba Greene, Erythea, 3: 36. 1895. 



Illustrations: Plate 73, f. 1-2; dissection of flower,/. 3; pistil, /. A; stamens, /. 

 5; fruiting hypanthium and calyx, /. 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. E. Rep. 4 : 84. 1857. 



Gray, Proc. Am. Acad. 6 : 530 ; 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. 



