474 MINNESOTA BOTANICAL STUDIES. 



rowly and sharply cut-toothed ; middle leaflet stalked, lateral 

 ones sessile, all cuneate at base ; the long petioles hirsute, widely 

 sheathing and smooth at the base : peduncles sulcate ; recepta- 

 cle pilose : flowers yellow ; calyx reflexed : akenes obliquely 

 round-obovate, slightly margined laterally, terminated by the 

 long erect style, smooth : head of fruit globose. June to July. 

 Meadows, Jalapa, Vera Cruz. Allied to R. dichotomus, leaves 

 nearly as finely dissected, yet much allied to R, Hookeri. 



22. R. macranthus SCHEELE, in Linnaea, 21 : 585. 1848. 

 R. repens\ai-. macranthus GRAY, PL Lindh. 2 : 141. 1850. 



Plant hairy ; erect or spreading, y 2 to 3 feet high : leaves 3- 

 5-divided, the middle leaflet longer stalked than the others, lobed 

 and cleft into narrower segments than in R. septentrionalis : 

 petals 7 to 16, yellow, 5 to 7 lines or longer, oblong toobovate; 

 sepals shorter, spreading : receptacle hairy : akenes flat, ovate 

 to orbicular, widely margined; style subulate, long, often only 

 partly persistent: head large, slightly lengthened. Texas, 

 southwestern Arizona into Sonora, Mex. 



23. R. subalpinus n. n. 



R. detyhinifolius H.B.K. Nov. Gen. & Sp. 5 : 38. 1821. 

 Not Torr. 



Roots fibrous : stem erect, branched above, few-flowered, 

 silky-hairy : radical leaves long-petioled, pilose on both sides, 

 ternate, lateral leaflets subsessile, 2-parted, terminal one well 

 stalked, 3-parted, segments 2-3-lobed, incised and toothed ; 

 lobes lanceolate ; stem leaves similar but smaller, short-petioled : 

 flowers on long peduncles, erect, as large as in R. bulbosus; 

 sepals 5, silky outside, reflexed, ovate, acutish, yellowish, much 

 shorter than the corolla ; petals about 15 (Jide BonpL), yellow, 

 glabrous, 5 lines long, spatulate-oblong, apex rounded, claw 

 furnished with a scale : young ovaries many, small, sessile, 

 ovate to subrotund, compressed, glabrous ; style long and slen- 

 der. May. Moist places. Altitude 8,000 to 9,000 feet. San 

 Miguelito Mountains and at Guanajuato, Mex. 



24. R. canus BENTH. PL Hartw. 294. 1848. 



R. Californicus var. canus WATS. Bot. Calif. I : 8. 1876. 



Plant canescent when young but often becoming green and 



sparingly villous ; erect or ascending, rather large, i to 2 feet 



high : leaves with mostly 3 or more divisions ; the middle one 



