470 MINNESOTA BOTANICAL STUDIES. 



Plant hirsute especially below, 3 to 15 inches high : lower 

 leaves 3-parted or 3-foliate, middle leaflets stalked, others often 

 sessile, all obovate-cuneate to roundish, cleft and toothed as in 

 R. repens : petals yellow, 4 to 6 lines long; sepals much 

 shorter, reflexed : akenes flat, orbicular, thin-margined ; beak 

 short-subulate : head oblong. Asia Minor, northern Africa, 

 Europe. Naturalized at Savannah, Norfolk, Philadelphia, 

 New York and St. John, N. B. 



10. R. micranthus NUTT. ex Torr. & Gray, Fl. i : 18. 1838. 

 R. abortivus var. mtcranthtis GRAY, Man. 5 ed. 42. 1867. 



Allied to JR. abortivus, but more slender, villous ; roots of 

 slender tubers : most of the lower leaves 3-parted, or divided 

 with the leaflets stalked : receptacle glabrous or nearly so. 

 April to May. Massachusetts, New York to Colorado, and 

 Saskatchewan. 



11. R. fascicularis MUHL. Cat. 54. 1813. 



Roots a fascicle of thickened fibres or tubers : plant finely 

 pubescent throughout, 3 to 10 inches high, tufted : leaves 

 mostly radical, long-petioled, 3- (rarely 5-) divided ; middle leaf- 

 let stalked, others usually sessile, deeply lobed and cleft into 

 oblong segments : petals 5 to 6, bright yellow, obovate-oblong, 

 rounded at apex, 4 to 6 lines long ; sepals much shorter, 

 spreading : akenes flattened, slightly margined, glabrous ; beak 

 nearly their length ; head ovate or oblong. April to May. 

 Ontario, New England to Texas, and Manitoba. Meehan's 

 Mo. 2. t. i. R. apricus GREENE, Pitt. 4: 145, 1900, is a form 

 from Indian Territory with the leaflets rather narrow and some- 

 times entire. 



Var. Deforest! n. var. 



Differs from the type in having all leaves but the first radical 

 ones cleft into linear to spatulate lobes : roots less thickened : 

 plant 3 to 4 inches high : petals 5 to 10, linear to oblong, 2 to 

 4 lines long. Collected by Harry P. DeForest (G. 42) near 

 Rossville, 111., April, 1885. 



12. R. septentrionalis POIR. in Lam. Encycl. 6 : 125. 1804. 

 ? R. lucidus POIR. 1. c. 113. 



R. tomentosus POIR. 1. c. 127. 



? R. Philonotis PURSH, Fl. 2 : 393. 1814. 



R. JEteZvtsuDC. Syst. i: 291. 1818. 



