MEMOIRS FROM THE DEPARTMENT OF BOTANY OF COLUMBIA UNIVERSITY 187 



10. SIBBALDIOPSIS. 



Potentilla Soland. in Ait. Hort. Kew. 2 : 216. 1789. 



Trichothalamios Spreng. Anl. 2: 864. In part. 1818. 



Hypanthium almost flat. Bractlets, sepals and petals 5. Petals white, obovate or 

 elliptic, neither unguiculate nor emarginate. Stamens about 20 in three series as nor- 

 mally in Potentilla, their insertion not distant from the base of the receptacle ; filaments 

 long and filiform; anthers round, cordate at the base, opening by a longitudinal slit. Re- 

 ceptable hemispheric, bearing numerous pistils ; style slender, filiform, lateral ; stigma 

 truncate ; achene turgid, villous ; seed ascending and amphitropous. 



A low undershrub with truly trifoliolate, subcoriaceous leaves, which much resemble 

 those of Sibbaldia. Torrey and Gray included this in their subgenus Comocarpa, but it 

 differs in so many respects from P. fruticosa that I think it is better to regard it as the 

 type of a distinct genus. 



I. Sibbaldiopsis tridentata (Soland.) 



Potentilla tridentata Soland. in Ait. Hort. Kew. 2 : 216. 1789. 



Vahl, Symb. 2 : 59 ; Poir. in Lam. Enc. Meth. 5 : 601 ; Persoon, Syn. PL 2 : 56 

 Willd. Sp. PL 2: 1010; Ait. Hort. Kew. Ed. 2, 3 : 279; Nestler, Mon. Pot. 28 and 66 

 Lehm. Mon. Pot. 30 and 190 ; Sprengel, Syst. Veg. 2 : 541 ; Seringe in DC. Prod. 2 

 585 ; Don, Gard. Diet. 2 : 552 ; Dietr. Syn. PL 3 : 180 ; Walp. Rep. 2 : 35; Ann. 2 : 470 

 Lehm. Rev. Pot. 22. 



Michx. FL Bor. Am. 1: 302; Pursh, FL Am. Sept. 353; Nutt. Gen. N. Am. PL 

 1 : 310; Eat. Man. Ed. 2, 378; Ed. 3, 407 ; Ed. 5, 343 ; Ed. 6, 279; Ed. 7, 456 ; Bige- 

 low, FL Bost. Ed. 2, 205 ; PL Bost. 218; Torr. FL U. S. 495; Comp. 209 ; FL N. Y. 207; 

 Torr. & Gray, FL N. Am. 1: 445; Eat. & Wr. N. Am. Bot. 372; Gray, Man. Ed. 1, 123 ; 

 Ed. 2, 119; Ed. 5, 155; Beck, Bot. 106 ; Ed. 2, 98; Chapman, FL S. U. S. 124; Darby, 

 Bot. So. States, 303; Wood, Class Book, 342; Am. Bot. & FL 107; Wats. Proc. Am. 

 Acad. 8: 562; Wats. & Coult. in Gray, Man. Ed. 6 : 160 ; Bailey, in Gray, F. F. and G. 

 Bot. Rev. Ed. 152 ; Britt. & Brown, 111. FL 2 : 215. 



Richardson, in Frankl. 1st Journ. 740; Ed. 2, App. 21 ; Lehm. in Hook. FL Bor. 

 Am. 1: 195; Schlecht. Linnaea, 10: 98; Provancher, FL Can. 188; Macoun, Cat. Can. PL 

 141 ; Durand, Journ. Acad. Phil. 1856 : 191 ; Lange, Consp. FL Groen. 10 and 236 ; 

 Rosenvinge, ibid. 650 ; Nathorst, Ofver. Kong. Vet. Ak. Forh. 1884 : 31 ; Meehan, Proc. 

 Acad. PhiL 1893: 210. 



? Potentilla retusa Retz. FL Scand. Prodr. 123. 1795. 



Don, Gard. Dictr. 2 : 550. 



