ranunculus. RANUNCULACE.E. 19 



most oval heads. Washington to Brit. Columbia and Canada. 



R. Oreganus. R. hispidus var. Oreganus Gray Proc. Am. Acad, xxi, 376. 

 Smooth or somewhat pubescent below with scattered hairs: stem stout, 

 3^-3 feet high, usually several from the fascicle of annual roots: leaves 

 ample, trifoliate ; the broadly-ovate leaflets deeply 3-lobed ; lobes mostly 

 lanceolate, serrate above the middle : petals obovate, 3-4 lines long, twice as 

 long as the reflexed sepals: achenesflat with aprominent border, 1-1)^ lines 

 long, tipped with a short subulate beak, in a large dense oblong or oval 

 h ad. Shady, and wet places about the mouth of the Willamette river. 



++ -* *+ Stems prostrate and stoloniferous. 



R. repexs L. Sp. i, 551. Pubescent; stems 1-2 feet long, trailing, rooting 

 at the lower joints : leaves ternately parted and often subdivided: sepals 

 spreading : petals 5 ; achenes 1^ lines long, rather sharply margined, the 

 nearly straight beak about \%. lines long. Naturalized in various places 

 from California to Brit. Columbia. 



R. septentrionalis Poir. Diet, vi, 125. Coarsely hirsute to glabrous : 

 stems stout, 1-3 feet high : often stoloniferous : leaves nearly all pedately 

 and pinnately 3-foliate ; leaflets 3-parted and sharply incised : flowers 

 large, often more than an inch broad : achenes strongly compressed, rather 

 gradually contracted into a long flat beak; heads ovoid. Northern Idaho 

 and eastward to New Brunswick. 



*+ ++ „ ++ Style more or less elongated and attenuate upwards, 

 stigmatose at the tip only : petals 5-15 : roots perennial. 



R. orthorhynchus Hook. Fl. i. 21, t. 9. Hirsute to nearly glabrous: 

 stems erect or ascending, 1-2 feet long, usually several from the fascicle of 

 thick fibrous roots: leaves mostly oblong in outline, pinnate, with 5-7 usu- 

 ally cleft or incised leaflets ; petals narrow obovate purple outside, 4-6 lines 

 long, much surpassing the reflexed sepals : achenes not very numerous, 

 ovate, nearly 2 lines 1- ng, strongly margined, tipped with a slender-subu- 

 late, rigid and quite straight beak about the same length. In wet places, 

 western Oregon to Brit. Columbia. 



R. maximus Greene Bull Torr. Club, xiv, 118. R. orthorhynchus var, 

 platyphyllus Gray J. c. 377. Pilose or hirsute with spreading hairs : stems 

 stout, 1-4 feet high, ascending or trailing, but not rooting: radical leaves 

 pinnate, 2-8 inches long, on long petioles; leaflets deeply 3-cleft or -parted, 

 the divisions laciniately 3-9-toothed : sepals ovate, acute, 3-4 lines long, 

 hirsute outside, soon reflexed : petals obovate-oblong, rounded at the sum- 

 mit, short clawed, 5-9 lines long, yellow with a dark base : achenes strong- 

 ly margined, tipped with a rigid, subulate, straight or slightly incurved 

 beak as long as the body. In wet places, Oregon and Washington to Cal- 

 ifornia and the Wahsatch Mountains. 



Annuals or biennials with muricate-echinate achenes. 



R. muricatus L. Sp. 1, 555. Glabrous : stems rather stout, 4-8 inches 

 high; leaves roundish or reniform, coarsely toothed : petals pale yellow, 

 longer than the sepals : achenes very large, flat, the sides coarsely muricate- 

 prickly, surrounded by a wide sharp smooth margin; beak stout and 

 straight. In wet places, Umpqua valley Oregon. Introduced from Europe. 



Tribe 4- Helleboreae DC. Sepals imbricated in the bud, petaloid. 

 Petals small or irregular or none. Carpels few, becoming several- 

 seeded follicles. 



* Perennial herbs. Flowers regular. Follicles 5-15. 

 6 CALTHA L. Gen. n. 703. 

 Smooth marsh plants with mostly radical, cordate or reniform 



