OF ARTS AND SCIENCES. 371 



pubescence deciduous : radical leaves mainly subcordate-oblong or 

 obscurely sagittate, the middle nerves approximate: petals broadly 

 obovate, half-inch long : akenes in a larger and oval head. — North 

 Arizona in De la Vergne Park of the San Francisco Mountains, in wet 

 ground, Lemmon. 



R. SuKSDORFii. A span or less high, glabrous, 1-3-flowered : 

 leaves small, somewhat reniforra or flabelliform, 3-5-cleft or parted, 

 divisions of the radical ones 3-5-clet't or incised, of the cauline linear : 

 petals round-obovate, retuse, a third to half an inch long, deep yellow : 

 akenes glabrous, turgid-lenticular, acutish-edged, surmounted by a 

 nearly liHform style of equal length (three fourths of a line), which 

 is apparently deciduous in age. — Mount Adams, Washington Terr., 

 at 6,000 to 7,000 feet, in damp ground, Suksdorf. 



2. Heads of carpels in fruit oblong or cylindraceous ; akenes more 

 turgid, rounded or at least obtuse on the back. 



R. EscHSCHOLTZii, Schlecht. This species has somewhat singu- 

 larly been referred to H. nivalis, but its nearest relative is R. affinis. 

 It has a much longer, slender-subulate, and mostly straight style. 



R. AFFiNis, R. Br., has a small and mostly recurved style, much 

 shorter tlian the ovary, at most only a quarter of the length of the 

 akene, and often its thickish base only persists at maturity. These 

 characters and the globular akenes well distinguish it from R. auri- 

 comus, L., of the Old World, to which some have referred it. 



Var. VALiDUS. Taking the slender high-northern form with even 

 the radical leaves sometimes " pedately multifid " as the original of 

 the species, the above name may be given generally to the stouter and 

 larger forms, of lower latitudes or elevation, with more succulent leaves, 

 the radical mostly undivided and roundish, either cordate or truncate 

 or cuneate at base, and from coarsely crenate to 3-7-cleft or parted, 

 some later ones occasionally divided and even with the divisions petiol- 

 ulate. To this belongs R. cardiophyllus, Hook., fii>ured both in the 

 Fl. Bor.-Am. and in Bot. Mag. t. 2999, but with the style too long. 

 3. Head of carpels in fruit globose ; styles minute and straight. 



R. RiiOMBOiDEus, Raf. Prec. Decouv. 36? «&; Goldie in Edinb. 

 Phil. Jour. t. 11, f. 1; Hook., etc. As Rafiuesque gives the habitat 

 " Canada and Gennessee," we may well suppose this was his plant ; 

 otherwise, his must remain wholly obscure. R. brevicaidis, Hook. 

 Fl. i. 13, t. 7, is evidently a much depressed form of this species ; and 

 here also may be referred R. auricomus, var. Cassubicus, E. Meyer, 

 PI. Labrad. 96. 



