Bye MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 
¢ 6. CONCINNAE. 
25. Potentilla concinna Richards. 
Potentilla concinna Richardson, in Frankl. 1st Journ. 739. 1823. Ed. 2: App. 20. 
Don. Gard. Dict. 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. Se. (II) 33: 411 (Rep. 22); Proe. Acad. Phil. 18683: 61; 
Rydberg, Cont. U. 8. Nat. Herb. 3: 497; Bull. Torr. Bot. Club, 23: 431. 
Lehm. in Hook. FI. Bor. Am. 1: 193. 
Potentilla humifusa Nutt. Gen. N. Am. Pl. 1: 310. 1818. Not Willd. 1813. 
Seringe in DC. Prod. 2: 574; Walp. Rep. 2: 34. 
Torr. Ann. Lye. N. Y. 2: 197; Hat. Man. Ed. 7: 409; Torr. & Gray, Fl. N. Am. 
1: 443: Eat. & Wright, N. Am. Bot. 374; Wats. Proc. Am. Aead. 8: 558; Rothrock, 
in Wheeler’s Exp. 4: 113; Porter & Coult. Syn. FI. 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. 8. Nat. Herb. 3: 497. 1896. 
Potentilla pulchella Sprengel, Syst. Veg. 4: Cur. Post. 199. 1827. 
Tormentilla humifusa Don, Gard. Dict. 2: 562. 
Iuuusrrations: Hook. Fl. Bor. Am. 1: pl. 67; Lehm. Mon. Suppl. pl. 7. PLATE 
14, f. 1; dissection of flower, f. 2; pistil, f 3; stamen, f 4; fruiting hypanthium and 
calyx, f. 5. 
Low and diffuse; stems many from the caudex 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 concinna humistrata Rydberg, Cont. U. 8. Nat. Herb. 3: 497 ( P. concinna 
humifusa Lehm. Rey. Pot. 112; P. hwmifusa Nutt. Gen. 1: 310) is a less spreading form 
