370 PROCEEDINGS OF THE AMERICAN ACADEMY 



and the Mexican plant, for which the name has by some been retained, 

 has more than one earlier available name. 



== = == Leaves all 2-4-ternately parted or divided into numerous 

 narrow divisions (of a line or less in width) : akenes turgid, sub- 

 ulate-beaked, dorsally marginless, smooth and glabrous or nearly 

 so : alpine or subalpiue low perennials, with strong fibrous-fascicled 

 roots, ascending stems and single or few large and showy flowers. 

 R. TRITERNATUS. Roots flesliy-fibrous : leaves usually triternately 

 divided and parted ; primary divisions long-petiolulate and lobes from 

 filiform-linear to linear-spatulate, obtuse ; petals broadly obovate (4 or 

 5 lines long) : akenes very turgid, rounded dorsally, slender-beaked ; 

 the head globose, with a thick globular receptacle in the manner of 

 R. f/Iaberrimus. — Klikitat Co., Washington Terr., on high hills near 

 Goldendale, Howell, by whom it has been distributed under the name 

 of R. Hookeri. A very early-flowering and depressed form has broader 

 radical leaves. 



R. ADONEUS, Gray, Proc. Acad. Philad. 1863, 56, with syn. — High 

 Rocky Mountains of Colorado and Utah ; first coll. by Parry. 



== = = = Leaves mostly cleft or more divided, some rounded radi- 

 cal ones undivided, but at least crenate or dentate : akenes turgid 

 or lenticular, marginless. 



a. Montane or high northern, truly perennials : flowers with conspicu- 

 ous and rather large petals, except in one form of R. affinis. 



R. Arizonicus, Lemmon in herb. Gray. A foot or less high, 

 glabrate or above glabrous, below usually with some soft villous hairs : 

 fascicled roots thickish : stems slender and naked above, several-many- 

 flowered : radical leaves round-cordate or sometimes cordate-oblong 

 and strongly crenate-dentate, or later ones 3-7-cleft and segments 

 3-5-lobed ; cauline once or twice 3-parted into narrow linear divis- 

 ions : petals o to 7, oblong or obovate (3 to 5 lines long) : akenes 

 lenticular with thin and acute margins, lightly pubescent, commonly in 

 a small globular head, having a subulate receptacle. — The plant sent 

 by Mr. Lemmon witli this name is the same as C Wright's no. 837, 

 also from S. Arizona, and which was taken for a form of R. afftnis in 

 the Botany of the Mexican Boundary. It grows in rather dry soil. 



Var. suBAFFiNis. Low, 1-few-flowered, like R. affinis, except the 

 (equally pubescent) sharp-edged akenes, almost equalled by the sub- 

 ulate style. — Mt. Agassiz, Lemmon. A form from S. Arizona, Roth- 

 rock, connects with the following. 



Var. SUBSAGITTATUS. Rather stout, decidedly villous, but the 



