MEMOIKS FROM THE DEPARTMENT OP BOTANY OF COLUMBIA UNIVERSITY 71 



Torr. & Gray, Fl. N. Am. 1 : 440; Walp. Rep. 2: 33. 



Potentilla chrysantha Lehm. in Hook. Fl. Bor. Am. 1 : 193. 1833. Not Trev. 1818. 



Potentilla gracilis Torr. in Frem. 1st Exp. 89. 1845. Not Dougl. 1829. 



Holz. Cont. U. S. Nat. Herb. 3: 223. In part. 1896. 



Potentilla gracilis var. rigida Wats. Proc. Am. Acad. 8 : 557. 1873. 



Porter & Coult. Syn. Fl. Col. 37 ; Brewer & Wats. Bot. Cal. !■: 179 ; Rothrock, U. 

 S. Geol. Surv. 4 : 113 ; Coulter, Man. Rocky Mts. 85 ; Rattan, An. Key W. Coast Bot. 51. 



Macoun, Cat. Can. PL 138. 



Potentilla gracilis chrysantha Rydb. Fl. Neb. 21 : 16. 1895. 



Illustrations : Lehm. Rev. Pot. pi. 33. Plate 26, f. 1; dissection of flower, /. 2 ; 

 stamen,/. "2; pistil,/. 3; fruiting hypanthium and calyx,/ 5. '■ 



Stem 6-8 dm. high, stout, sparingly hirsute, branched above, with long branches. 

 Stipules lanceolate, acute, subentire. Basal leaves many, digitate, of about 7 leaflets, 

 prominently veiny and sparingly hirsute, not at all tomentose beneath, green, with petioles 

 1-3 dm. long; leaflets 5-10 cm. long, oblanceolate, toothed or divided nearly half- 

 way to the midrib, with large triangular divergent acute teeth. Stem leaves smaller 

 and short-petioled. Cyme many-flowered, loose and open. Hypanthium hirsute, in 

 fruit about 1 cm. in diameter ; bractlets linear to lanceolate, generally shorter than the 

 ovate-lanceolate long-acuminate sepals. Corolla 10-15 mm., yellow ; petals obovate, 

 emarginate, about the length of the calyx. 



The general habit of this species resembles that of P. Blaschheana, but the flowers are 

 smaller and the plant is green, without tomentum and coarsely hirsute. The distribution 

 is from Colorado to California, British Columbia and Saskatchewan. 



Potentilla Nuttallii glabrata Lehm. 



Potentilla Nuttallii glabrata Lehm. Rev. Pot. 89. 1868. 



More slender, more glabrous, the leaves with deeper and narrower lobes. 



Fremont, 1842. 



Oregon: Burke; C. V. Piper, No. 2468, 1896. 



51. Potentilla rjecta L. 



Potentilla recta L. Sp. PI. 497. 1753. 

 Potentilla corymbosa Moench, SuppJ. 279. 1802.* 



Potentilla obseura Willd. Sp. PI. 2 : 1100 ; Nestler, Mon. 44 ; Lehm. Mon. 82 ; Eev. Pot. 82 ; 

 Spreng. Syst. Veg. 2 : 536. 



Potentilla Tiirta obseura DO. Prod. 2 : 578. 1825. 



