114 MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



Potentilla Hippiana propinqua Rydb. 

 PuUamia Hippiana diffusa Lehm. Ind. Sem. Hort. Bot. Hamb. 1849: 8. 

 Rev. Pot. 62; AYalp. Ann. 2: 480. 

 Rydberg, Cent. U. S. Nat. Herb. 3: 497. 1896. 



Potentilla diffusa Gray, ^lem. Am. Acad. 1849 : 41. 1849. Not Willd. 

 Terr. Sitgreave's Rep. 159, 1853. 



Potentilla Hippiana pulchcr lima Wats. Cont. Am. Acad. 8: 555. In part. 1873. 

 Coulter, Man. Rocky Mts. 84 (in part); Aven Nelson, Wy. Exp. Sta. Bull. 28: 103 



(in part). 



Potentilla Hippiana propincpca Rydb. Bull. Torr. Bot. Club, 24: 3. 1897. 



The stem is more diffuse or ascending, rather low ; the leaflets are more approxi- 

 mate and more silky, scarcely at all tomentose, often green above, when they somewhat 

 resemble those of P puMcrrima, which is a much taller plant. This has the same 

 range as the species. 



100. Potentilla effusa Dougl. 



Potentilla eff'usa Dougl.; Lehm. Stirp. Pug. 2 : 8. 1830. 



Don, Gard. Diet. 2 : 557; Dietr. Syn. PL 3 : 186; Walp. Rep. 2 : 32 ; Ann. 2 : 

 480; Lehm. Rev. Pot. 64. 



Eat. Man. Ed. 7 : 458 ; Torr. & Gray, Fl. N. Am. 1 : 437 ; Eat. & Wr. N. Am. Bot. 

 374; Hook. Journ. Bot. 6 : 219 ; Wats. Proc. Am. Acad. 8 : 555 ; Porter & Coult. Syn. 

 Fl. Colo. 36; Coulter, Man. Rocky :\lts. 84; Wats. & Coult. in Gray, Man. Ed. 6: 159; 

 Rydb. Bull. Torr. Bot. Club, 24:2; Britt & Brown, 111. Fl. 2 : 214. 



Lehm. in Hook. Fl. Bor. Am. 1 : 187 ; Macoun, Cat. Can. PI. 138 and 517. 



Illustrations: Lehm. Rev. Pot. pi. .22; Britt. & Brown, 111. Fl. 2: /. 1028. 

 Plate 4-1, f- 3; dissection of flower, /. 4.. 



Stems many from the root, 2-4 dm. high, more slender than in the preceding, slightly 

 silky, ascending or diffuse, dichotomously paniculately branched with more spreading 

 branches ; stipules lanceolate, subentire. Basal leaves many with slender petioles 2-5 cm. 

 long, generally interrupted pinnate with 2-5 pairs of leaflets. Stem leaves often 1-3-folio- 

 late, grayish tomentose on both sides; leaflets cuneate-oblong, the upper often confluent, 

 crenate with broad generally ovate teeth. Flowers paniculate-cymose. Bractlets linear 

 or linear-lanceolate, generally much shorter than the lanceolate acuminate sepals. 

 Petals obovate, retuse, a little longer than the calyx. Stamens 20. Pistils 20-40. 



The pubescence is grayish or whitish tomentose, not at all silky ; the branches are 

 rather divergent and the bractlets much smaller than the acuminate sepals. It grows on 



