MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 83 



§ 13. BIFLORAE. 



65. Potentilla biflora Willd. 



Potentilla biflora Willd.; Schlecht. in Mag. Ges. Naturf. Fr. Berlin, 7: 297. 1813. 



Lehm. Mon. Pot. 30 and 192 ; gprengel, Syst. Veg. 2 : 541 ; Seringe, in DC. Prod. 

 2 : 586; Don, Gard. Diet. 2: 552; Dietr. Syn. PL 3: 180; Lehm. Rev. Pot. 20; Ledeb. 

 Fl. Ross. 2 : 61. 



Eat. Man. Ed. 7: 457; Torr. & Gray, Fl. N. Am. 1 : 442; Eat. & Wr. N. A. Bot. 

 372; Wats. Proc. Am. Acad. 8 : 561 ; Rydb. Bull. Torr. Bot. Club, 24: 13. 



Richardson, in Frankl. 1st Journ. 740 ; Ed. 2, App. 21 ; Cham, and Schlecht. in 

 Linnaea 2: 24; Lehm. in Hook. Fl. Bor. Am. 1: 195; Hook, and Am. in Beechey's 

 Voy. 123; Ledeb. Fl. Ross. 2 : 61 ; Seemann, Bot. Herald, 29; Macoun, Cat. Can. PI. 140. 



Potentilla hifolia Walp. Ann. 2 : 470. 1852. 



Illustrations: Lehm. Mon. Pot. pi. W; Rev. Pot. pi. 62, f. 1. Fixate 33, f. 6 ; 

 dissection of flower, /. 7 ; pistil, /. 8 ; fruiting hypanthium and calyx, /. 9. 



Cespitose ; flowering branches scape-like, 1-2-, seldom few-flowered, erect, less than 1 

 dm. high, sparingly hirsute-villous. Stipules lanceolate, acuminate, brown. Leaves 

 basal, ternate, with the middle leaflet deeply 3-divided, the lateral ones 2-divided into 

 linear segments with more or less revolute margins, sparingly villous-hirsute, in age 

 nearly glabrous above, and with a strong midrib beneath. Flowers less than 1 cm. in 

 diameter. Hypanthium sparingly hairy, in fruit about 7 mm. in diameter; bractlets 

 oblong, obtuse, about equalling the ovate-lanceolate acute sepals. Petals obovate, slightly 

 emarginate, longer than the sepals, yellow with an orange spot. 



It is a native of northeastern Asia, Alaska and the Arctic coast of North America, 

 and a rather rare plant. 



Alaska: Dr. Jerrans, 1894 (Cape Thomas); J. T. White, 1894 (Port Clarence) ; 

 Muir. No. 112, 1881. 



Wrangell Island : Dr. Ross, 1881. 



§ 14. NIVEAE. 

 66. Potentilla Pringlei Wats. 



Potentilla Pringlei Wats. Proc. Am. Acad. 23 : 272. 1888. 



" Stem decumbent, a foot long or more including the paniculate few-flowered inflorescence, finely 

 tomentose; leaves mostly radical, tprnately digitate; leaflets broadly linear (1 or 2 inches long by 

 about 2 lines broad), acutely toothed, nearly glabrous above, densely white- tomentose beneath ; flowers 



