114 MEMOIRS FROM THE DEPARTMEN'ET OF BOTANY OF COLUMBIA UNIVERSITY 
Potentilla Hippiana propinqua Rydb. 
Potentilla Hippiana diffusa Lehm. Ind. Sem. Hort. Bot. Hamb. 1849: 8. 
Rev. Pot. 62; Walp. Ann. 2: 480. 
Rydberg, Cont. U. S. Nat. Herb. 3: 497. 1896. 
Potentilla diffusa Gray, Mem. Am. Acad. 1849: 41. 1849. Not Willd. 
Torr. Sitgreave’s Rep. 159, 1853. 
Potentilla. Hippiana pulcherrima Wats. Cont. Am. Acad. 8: 555. In part. 1875. 
Coulter, Man. Rocky Mts. 84 (in part); Aven Nelson, Wy. Exp. Sta. Bull. 28: 103 
(in part). 
Potentilla Hippiana propinqua Rydb. Bull. Torr. Bot. Club, 24: 8. 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. pulcherrima, which is a much taller plant. This has the same 
range as the species. 
100. Potentilla effusa Dougl. 
Potentilla effusa Dougl.; Lehm. Stirp. Pug. 2: 8. 1850. 
Don; Gard: Dict 227557; Dietr. Syn, Pl 37 1862) Walp. iep: 2325 “Anna ee 
480; Lehm. Rev. Pot. 64. 
Eat. Man. Ed. 7: 458; Torr. & Gray, Fl. N. Am. 1: 487; Eat. & Wr. N. Am. Bot. 
374; Hook. Journ. Bot. 6: 219; Wats. Proc. Am. Acad. 8: 555; Porter & Coult. Syn. 
Fl. Colo. 836; Coulter, Man. Rocky Mts. 84; Wats. & Coult. in Gray, Man. Ed. 6: 159; 
Rydb. Bull. Torr. Bot. Club, 24: 2; Britt & Brown, Ill. Fl. 2: 214. 
Lehm. in Hook. Fl. Bor. Am. 1: 187; Macoun, Cat. Can. Pl. 138 and 517. 
Intustrations: Lehm. Rev. Pot. pl. 29; Britt. & Brown, Ill. Fl. 2: f. 1928. 
PuatE 41, f. 3; dissection of tlower, f. 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 em. 
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 
