Davis: RANUNCULI OF NORTH AMERICA, 487 
55. R. Mexicanus n. n. 
A. geomdes t.B.K. Noy.:Gen. and Sp. 5+ 37.'t ¢29; 
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 1 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. 1: 35. 
1831. 
Roots fibrous: stem erect, 1 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. ¢. 428. 
TOZt. 
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 
