MEMOIRS FROM THE DEPARTMENT OF BOTANY OP COLUMBIA UNIVERSITY 81 



63. Potentilla emarginata Pursh. 



PotentUla emanj'nmta Pursh, Fl. Am. Sept. 353. 1814. 



Poir. in Lam. Enc. IMeth. Suppl. 4: 541 ; Lehm. Mon. Pot. 29 and 174; Spreugel, 

 Syst. Veg. 2 : 540; Don, Gard. Diet. 2 : 551 ; Dietr. Syn. PL 3 : 179 ; Walp. Rep. 2 : 35 ; 

 Ann. 2: 506; Lehm. Rev. Pot. 161. 



Nntt. Gen. N. A. PL 1 : 310 ; Eat. Man. Ed. 5 : 343 ; Ed. 6 : 280 ; Ed. 7 : 456 ; 

 ToiT. & Gray, FL N. Am. 1 : 446 ; Eat. and Wr. N. Am. Bot. 372 ; Wats. Proc. 

 Am. Acad. 8 : 559 ; Rydb. Bull. Torr. Bot. Club, 23 : 305 ; Britton & Brown, 111. 

 FL 2: 211. 



E. Meyer, PL Lab. 74 ; Lehm. in Hook. FL Bor. Am. 1 : 1 94 ; Sommerf. in Mag. 

 Naturv. 2: 244^'=; Schlecht. Linnsea, 10: 98; Seemann, Bot. Herald, 51 and 56; Lange, 

 Consp. Fl. Groenl. 8 and 235 ;' Rosenvinge, I. c. 655 ; Macoun, Cat. Can. PL 1 : 140 

 Meehan, Proc. Acad. PhiL 1893: 210; Wetherill, Peary Aux. Exp. 5. 



Poteidilla Fra(j(iria var. enuirginata Ser. in DC. Prod. 2 : 5SG. 1825. 



Illustrations: Fl. Dan. 13: pi. ±391; Britton & Brown, IlL FL 2:/. 1919. 

 Plate o'2, /. 11; dissection of flower, /. 1^ : pistil, /. 13; stamen, /. 14; fruiting hy- 

 panthium and calyx, /. 15. 



LoAV and densely tufted. Stems about 1 dm. high, 1-2-leaved and 1-2-flowered, 

 softly villous-hirsute. Stipules lanceolate or ovate-lanceolate, scarious and broAvn. 

 Leaves ternate with sessile leaflets, softly hirsute ; leaflets obovate, with a cuneate entire 

 base, deeply serrate toward the apex with acute teeth, of which the terminal is the largest. 

 Hypanthium villous-hirsute, in fruit 8-10 mm. in diameter; bractlets oblong-lanceo- 

 late, acute, about equalling the slightly broader acute sepals. Petals broadly obcordate, 

 longer than the sepals. 



This species was described from specimens collected by Kohlmeister in Labrador. 

 According to Lehmann (Hook. Fl. Bor. Am. 1 : 194) P. nana also was collected by the 

 same missionary. There is, therefore, a doubt which of the two is the original P. emar- 

 ginata. The latter, as understood by Vahl, Lehmann and others, is a stouter plant than 

 P. nana, has very narrow bracts, and leaves with acute teeth, of which the terminal is 

 generally the largest. In both the flowering stems scarcely exceed the leaves. P. emar- 

 ginata grows on the Arctic coast of North America, in Labrador, the Baffin Bay region, 

 Greenland and Spitzbergen. 



Alaska;: (Pt. Barrow) G. S. Oldmixon, 1882 ; Mundock, No. 2227, 1896. 



Wrangell Island: J. Muir, 1881. 



Jones Sound: Dr. H. E. Wetherill, Nos. 144 and 160, 1894. 



'Syn. P. fragiformis parviflora Traut. 



