MEMOIRS FROM THE DEPARTMENT OP BOTANY OF COLUMBIA UNIVERSITY 69 



48. Potentilla Blaschkeana Turcz. 



Potentilla Blaschkeana Turcz; Lehm. in Otto, Gart. u. Blumenz. 9: 506. 1853. 

 Lehm. Ind. Sem. Hort. Hamb. 1853: 9; Rev. Pot. 107; Rydb. Bull. Torr. Bot. 

 Club, 24 : 6. 



PotentiUagracilisWats. King's Rep. 5: 88. 1871. Not Dougl. 1829. 



Wats. Proc. Am. Acad. 8 : 557 (in part); Brewer & Wats. Bot. Cal. 1 : 179 (mainly); 

 Rothrock, U. S. Geol. Surv. 4: 113; Coult. Man. Rocky Mts. 85 (in part); U. S. Geol. 

 Surv. 1872: 765; Tweedy, Fl. Yell. Nat. Park, 35; Rattan, An. Key W. Coast Bot. 51; 

 Greene, Fl. Fran. 1 : 64; Aven Nelson, Wy. Exp. Sta. Bull. 28: 102, in part; K. Bran- 

 degee, Zoe, 2 : 162. 



Macoun, Cat. Can. PL 138 and 517. In part. 



Potentilla gracilis flabelliformis Newberry, Pac. R. R. Rep. 6: Part 3, 72. 1857. 



Illustrations: Lehm. Rev. Pot. j?/. 64. Plate 25, f. 1; dissection of flower,/. 2; 

 pistil,/. 3; stamen,/ 4; fruiting hypanthium and calyx,/ 5. 



Stem stout, 5-8 dm. high, sparingly silky, branched above. Stipules large, 1-2 cm. 

 long, lanceolate or ovate-lanceolate, acute, the upper often coarsely toothed. Basal leaves 

 digitate, of about 7 leaflets, silky, or nearly smooth and green above, white-tomentose be- 

 neath, with petioles 5-15 cm. long; leaflets about .5 cm. long, obovate in outline, deeply 

 toothed or cleft into ovate or oblong teeth, often divergent. Stem leaves similar but 

 smaller and short-petioled. Cyme many-flowered and open. Hypanthium silky, in 

 fruit often over 1 cm. in diameter; bractlets oblong-lanceolate, often much shorter than 

 the broadly lanceolate long-acuminate sepals. Corolla 15-20 mm. in diameter; petals 

 broadly obcordate^ deeply notched at the apex, much longer than the sepals. 



This differs from P. gracilis in stouter habit, ascending branches, larger flowers and 

 broader leaflets, which are obovate, deeply toothed or cleft into ovate or oblong teeth, 

 silky and green above, silky and tomentose beneath. It must be admitted that this 

 species is near to the preceding ; it Avas merged therein by Watson, but it is evidently 

 not as near P. gracilis as is P. pulcherrhna, which differs only in the form of the 

 teeth. 



P. Blaschkeana is common from California to Wyoming and northward as far as 

 Kodiak, off Alaska. 



49. Potentilla viridescens. 



Stem 5-7 dm. high, sparingly silky with appressed or slightly spreading hairs, 

 branched above, with long spreading branches. Basal leaves several, with petioles 1-2 dm. 



