158 MEMOIRS FEOM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 



more. Petals yellow, broadly elliptic, or almost orbicular, not at all unguiculate, obtuse, 

 never emarginate. Stamens 20-25, in three series, inserted closely around the base of the 

 receptacle as in Potentilla ; filaments filiform, rather short ; anthers slightly didymous, de- 

 hiscent by a longitudinal slit. Receptacle hemispheric, bearing very numerous pistils ; 

 style filiform, lateral, attached almost at the middle of the ovary, scarcely deciduous. 

 Mature achene with very thick and corky pericarp. Seeds ascending and amphitropous. 

 The genus contains three species, of which one, A. anserinoides, is a native of New 

 Zealand, the two others of arctic and colder temperate regions of the northern hemi- 

 sphere. They are easily recognized by their interruptedly pinnate leaves, which are gen- 

 erally silvery-white beneath, and their long runners. The flowers are borne on simple 

 pedicels from the axils of the basal leaves, or more commonly from those of the leaves 

 of the plantlets formed on the runners. The roots become thick and fascicled, and are 

 used as an article of food by the natives of Siberia and on the Scottish Islands Tiree 

 and Coll. 



I. Argentina Egedii (Wormsk.). 



Potentilla Egedii Wormsk. Fl. Dan. 9 : fasc. 27, 5. 



Lehmann, Mon. 22 and 74 ; Ser. in DC. Prod. 2 : 282 ; Spreng. Syst. Veg. 2 : 535 ; 

 Tratt. Ros. Mon. 4 : No. 43*; Don, Card. Diet. 2 : 560 ; Dietr. Syn. PI. 3 : 189 ; Rydb. 

 Bull. Torr. Bot. Club, 24 : 12. 



Potentilla Anserina Groenlandica Tratt. Mon. Ros. 4 : No. 13. 1824.* 



DC. Prod. 2 : 582 ; Lehm. Del. Sem. Horfc. Hamb. 1850: 10; Rev. Pot. 190 ; Don, 

 Card. Diet. 2 : 559 ; Walp. Rep. 2 : 34 ; Ann. 2:514. 



Hook. Parry's 3d Voy. 125*; Fl. Bor. Am. 1: 189; Torr. & Gray, Fl. N. Am. 1: 

 444; Schlecht. Linnaea, 10: 98; Eat. & Wr. N. Am. Bot. 373; Lange, Consp. Fl. 

 Groen. 5 and 234; Rosenvinge, ibid. 655; Macoun, Cat. Can. PL 141; Nathorst, Oefv. 

 Kong. Vet. Ak. Forh. 1884 : 30; Eat. Man. Ed. 5 : 344 ; Ed. 6 : 281. 



Potentilla Anserina Egedii Torr. & Gray, Fl. N. Am. 1: 444. 1840. 



Walp. Rep. 2 : 34; Britt. & Brown, 111. Fl. 2 : 216. 



Illustrations : Fl. Dan. 9 : pi. 1578. Plate 97, f. 6 ; dissection of flower, /. 7; pis- 

 til, /. 8; fruiting hypanthium, /. 9. 



Perennial with a fascicled root and producing long runners, much smaller in size 

 than the following species. Leaves 3-5 cm. long, pinnate with 5-15 leaflets, nearly or 

 perfectly glabrous above, sometimes white-tomentose beneath, but never silky; leaflets 

 broadly obovate or nearly orbicular, .5-1 cm. long, coarsely toothed with rounder teeth 

 than in the following. Flowers of about the same size as those of the following species, 



