Davis: RANUNCULI OF NORTH AMERICA, 487 



55. R. Mexicanus n. n. 



R. gcoides H.B.K. Nov. Gen. and Sp. 5: 37. t. 429. 

 1821. Not Siev. 1794. 



Roots fibrous : stem 5 to 8 inches high, simple or branched 

 low ; plant silky pubescent up to and including under side of 

 sepals : radical leaves 3-parted nearly to midrib : divisions 

 toothed or incised, ovate-cuneate ; petiole i to 2 inches long ; 

 stem leaf with 3 to 5 narrow segments, sessile or on petiole 

 sheathing the stem ; bracts linear : flowers (rarely 2 to 3), 

 large, terminating long, erect peduncles ; sepals 5, ovate, much 

 shorter than petals, reflexed ; petals 10, spatulate oblong, rather 

 obtuse, 5-7 lines long, spreading, claw provided with nectar 

 pit and scale : akenes compressed, smooth ; style as long as 

 akene body, persistent for a time, erect. May. Real del 

 Monte, north of Mexico City; Guajuco, Nuevo Leon, northern 

 Mexico. 



56. R. uncinatus D. DON ex G. Don, Gen. Syst. i : 35. 

 1831. 



Roots fibrous : stem erect, i foot high : plant glabrous : rad- 

 ical leaves not seen ; stem leaves long-petioled, 3-parted, seg- 

 ments 3-lobed ; lobes toothed or again lobed, acute; leaves 

 near the flower ternate, leaflets linear-lanceolate, acute, quite 

 entire : flowers small, yellow, terminal and lateral, on slender 

 peduncles : akenes few, ending in hooked beaks : head 

 globose. Mexico. 



57. R. petiolaris H.B.K. Nov. Gen. and Sp. 5: 36. t. 428. 

 1821. 



Roots fibrous : stem erect, striate, puberulent, somewhat 

 branched above, about 6-flowered : radical leaves on petioles 6 

 to 7 inches long, 3-parted nearly to the midrib ; the divisions 

 often 2-3-lobed and incised ; the lobes often somewhat oblong- 

 cuneate, deep green and appressed-pubescent above, pale and 

 appressed-pilose beneath ; stem leaves short-petioled, smaller 

 and with much more slender lobes ; bracts linear-lanceolate, 

 lobed or entire ; base of petioles membranaceous, somewhat 

 sheathing : flowers medium size, on erect peduncles which are 

 pilose; sepals 5, ovate-oblong, acute, pilose beneath, shorter 

 than the petals, reflexed, deciduous; petals 5, obovate, rounded 

 at the end, a claw and scale at base, yellow, glabrous, about 4 



