52 



MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



§ 6. CONCINNAE. 

 25. Potentilla concinna Richards. 



Potentilla concimia Richardson, in Frankl. 1st Journ. 739. 1823. Ed. 2 : App. 20. 



Don, Gard. Diet. 2 : 554 ; Dietr. Syn. PL 3 : 183 ; Walp. Rep. 2 : 34 ; Ann. 2 : 

 488 ; Lehm. Mon. Suppl. 1:16; Stirp. Pug. 2 : 13 ; Rev. Pot. 112. 



Eat. Man. Ed. 7 : 457 ; Torr. & Gray, Fl. N. Am. 1 : 443 ; Eat. & Wr. N. Am. Bot. 

 373; Gray, Am. Journ. Sc. (II) 33: 411 (Rep. 22); Proc. Acad. Phil. 1863: 61; 

 Rydberg, Cont. U. S. Nat. Herb. 3 : 497 ; Bull. Torr. Bot. Club, 23 : 431. 



Lehm. in Hook. Fl. Bor. Am. 1: 193. 



Potentilla humifusa Nutt. Gen. N. Am. PI. 1: 310. 1818. Not Willd. 1813. 



Seringa in DC. Prod. 2 : 574 ; Walp. Rep. 2 : 34. 



Torr. Ann. Lye. N. Y. 2 : 197 ; Eat. Man. Ed. 7 : 459 ; Torr. & Gray, Fl. N. Am. 

 1: 443; Eat. & Wright, N. Am. Bot. 374; Wats. Proc. Am. Acad. 8 : 558; Rothrock, 

 in Wheeler's Exp. 4: 113; Porter & Coult. Syn. Fl. Colo. 37; Coult. Man. Rocky 



Mts. 85. 



Macoun, Cat. Can. PL 139 and 518. 



Potentilla concinna humifusa Lehm. Stirp. Pug. 9 ; Rev. 112 ; Walp. Ann. 2 : 488. 



Potentilla concinna humistrata Rydb. Cont. U. S. Nat. Herb. 3 : 497. 1896. 



Potentilla pukhella Sprengel, Syst. Veg. 4: Cur. Post. 199. 1827. 



Tormentilla humifusa Don, Gard. Diet. 2 : 562. 



Illustrations : Hook. Fl. Bor. Am. 1 : pi. 67 ; Lehm. Mon. Suppl. pi 7. Plate 

 14., f. 1; dissection of flower,/ 2; pistil,/. 3; stamen,/ 4.; fruiting hypanthium and 

 calyx, / 5. 



Low and diflfuse ; stems many from the eaudex in the typical form, generally 

 spreading, more or less tomentose. Stipules ovate-lanceolate, acuminate. Leaves densely 

 white-tomentose beneath, silky and slightly tomentose above when young, digitate (some- 

 times approximately pinnate ), of 5 leaflets ; leaflets obovate or cuneate, more or less 

 deeply toothed, 1-3 cm. long. Hypanthium silky- villous and tomentose, in fruit 8-10 

 mm. in diameter. Bractlets oblong, obtuse or mucronate, nearly equalling the ovate 

 sepals. Petals obcordate, a little exceeding the sepals. 



P concinna resembles P. nivea and P. quinquefolia in many respects, but is always 

 more or less prostrate, and has broader petals and sepals. It is very variable as to the 

 shape of the leaves. It ranges from Colorado to Utah and Saskatchewan. 



Potentilla concittna humistrata Rydberg, Cont. U. S. Nat. Herb. 3 : 497 (P. concinna 

 humifusa Lehm. Rev. Pot. 112 ; P. hicmifusa Nutt. Gen. 1 : 310) is a less spreading form 



