478 MINNESOTA BOTANICAL STUDIES. 



Var. Harveyi GRAY, Proc. Am. Acad. 21 : 372. 1886. 

 R. abortivus var. grandiflorus ENGELM. ex Branner & Co- 



ville, Ark. Geol. Surv. 6: 162. 1891. 

 R. Harveyi BRITTON, Mem. Torr. Club, 5: 159. 1894. 

 Stem and foliage more slender and roots often thicker than 

 in the type : plant somewhat pubescent : petals of the extreme 

 forms 3 lines long and much longer than the sepals : akenes 

 sometimes few, large and in a globose head, but varying to 

 those of the type. Damp rocks, Arkansas to St. Louis, Mo. 

 Var. australis BRAND. Zoe 4 : 399. 1894. 

 Lower leaves large, reniform : petals 2 to 3 lines long ; 

 flowering in August. Abundant in wet places, high summits 

 of Sierra de la Laguna and San Fransisquito, Lower Cali- 

 fornia. 



33. R. sceleratus LINN. Sp. PI. 551. 1753. 



Stems stout, hollow : plant glabrous or nearly so, one-half to 

 2 feet high, branching : radical and lower stem leaves thick, 

 long-petioled, 3~5-lobed, reniform or cordate ; lobes cuneate, 

 crenately incised or cleft; upper stem leaves sessile or petioled, 

 deeply lobed or parted ; the lobes cuneate-oblong or linear, 

 toothed or entire : petals i to 2 lines long, yellow ; sepals often 

 a little shorter : akenes numerous, very small, compressed, 

 glabrous, barely apiculate : head oblong. April to Aug. Wet 

 ditches and shallow water. New Brunswick to Florida and 

 somewhat westward. Europe and Asia. 



34. R. eremogenes GREENE, Erythea, 4 : 121. 1896. 



R. sceleratus var. multijidus NUTT. ex Torr. & Gray, Fl. 

 I : 19. 1838. 



Leaves more dissected than R. sceleratus: stem nearly leaf- 

 less : head of akenes nearly globose or ovate, large. Habitat 

 of that species, eastern base of Rockies in Colorado to the 

 Sierra Nevadas, to northwest British America and south to 

 Arizona. 



Var. degener GREENE, Pitt. 4: 144. 1900. 



Stems several, short, ascending : roots coarser than in the 

 type : akenes with no marginal development : head more 

 rounded. Southern Colorado. 



35. R. Allegheniensis BRITTON, Bull. Torr. Club, 22: 224. 

 1895. 



R. abortivus HOOK. Fl. 1 : 15. 1829. In part. 



