476 MINNESOTA BOTANICAL STUDIES. 



28. R. Aschenbornianus SCHAU. in Linnasa, 20 : 719. 1847. 

 Stem erect, many-flowered : leaves hairy to subhirsute ; 



radical leaves long-petioled, ternate to bipinnate, the pinnules 

 3-parted to many lobed, the lobes nearly linear; peduncles 

 silky : sepals reflexed : receptacle subpilose : akenes com 

 pressed, slightly margined, smooth, with fine impressions or 

 punctures, style straight : fruit in a globose head. Mountains 

 of Mexico near " Tutam." 



29. R. acriformis GRAY, Proc. Am. Acad. 21 : 374. 1886. 

 R. acris HOOK. Fl. i: 18. 1829 (partly). 



Plant with short rather appressed pubescence, slender, erect, 

 i foot or more in height : leaves all 3~7-parted or divided ; 

 divisions 2-3-cleft or lobed, into lanceolate or linear segments 

 which are often entire : petals yellow, roundly obovate, about 

 3 lines long ; sepals about half as long, spreading or becoming 

 reflexed: akene i to 2 lines long: beak half as long, curved. 

 Eastern Rockies in Alberta ; Montana, Wyoming ; wet places. 

 Southern Colorado at 10,000 feet. 



R. Montanensis Rydb. Mem. N. Y. Bot. Gard. i : 166, 

 1900, is a form with beak more slender and more curved. 



30. R. Californicus BENTH. PI. Hartw. 295. 1848. 



R. acris var. Deppi'i NUTT. ex Torr. & Gray, Fl. i : 21. 



1838. 

 R. delphinifolius TORR. & GRAY, Fl. i : 659. 1838. 



Not Torr. 

 R. dissectus HOOK. &. ARN. Bot. Beech. 316. 1841. 



Not Bieb. 

 R. regulosus GREENE, Pitt. 2 : 58. 1890. 



Roots fibrous: plant rather weak, y 2 to 2 feet high, usually 

 pubescent or hirsute ; branching and without leaves in upper 

 part: leaves ternately divided or parted, or palmately 5-divided 

 into linear or narrow often 2-3-parted divisions : petals 6 to 15, 

 glossy yellow, oblong or narrowly obovate, 4 to 6 lines long : 

 akenes flat, slightly margined, nearly 2 lines long : beak very 

 short. Rather dry places. Western California and adjacent 

 Oregon, common. Cultivated. 



Var. Ludovicianus (GREENE). 



R. Ludovicianus GREENE, Bull. Cal. Acad. Sci. 2 : 58. 

 Mch. 6 1886. 



