RANUNCULI OF NORTH AMERICA. 465 



LL. Sepals spreading. 



40. acris; 41. McCallai. 



KK. Akenes turgid or lenticular, marginless. 



L. Head of fruit oblong or cylindraceous. 



42. pedatijidus; 43. vicinalis ; 44. 



Eschscholtzii; 45 eximius ; 



46. saxicola. 



LL. Head of fruit globose or oval. 



47. Suksdorfii; 48. avails; 

 49. Arizonicus. 



II. Types from Old World, cultivated here, not 



naturalized 50. montanus ; 



5 1 . corthiiscefolius. 



III. Types found only ' in Mexico and southward 

 (see also var. of 32). 



' J. Plants with several slender scapose stems 

 bearing only bracts and terminal flowers. 



52. longipedunculatus. 

 JJ. Plants usually with true stems, i to 8 inches 



high 53. Donianus ; 



54. multicaulis ; 55. Mexicanus. 

 JJJ. Plants with true stems one foot high or 



more 56. uncinatus ; 57. petiolaris. 



HHH. Leaves all 2 to 4 times ternately parted or di- 

 vided, divisions i line or less in width ; flowers few, 

 large; plants alpine or subalpine, low, decumbent 



or spreading 58. adoneus ; 59- triternatus. 



HHHH. Leaves all palmately or pedately lobed or 

 divided; sepals nearly equal to the petals; plants 

 low, tufted, arctic or alpine. 



60. Grayi ; 61. pygmceus. 



HHHHH. Leaves, some of them, quite entire (ex- 

 cept in 62) ; others with a few entire lobes; plants 



low and glabrous 62. oxynotus ; 63. digitatus ; 



64. glaberrimus. 

 FF. Sepals densely clothed beneath with black or dark 



brown wool 65. Macauleyi ; 66. nivalis. 



EE. Plants spreading by slender creeping stolons or root- 

 stocks 67. natans ; 68. hyperboreus ; 69. Lapponicus. 



DD. Plants aquatic or amphibious. 



70. delphinifolius ; 71. Purshii ; 72. Missouriensis . 

 CC. Flowers white (except in a double garden form of 73). 



73. aconitifolius ; 74. Pallasii. 



BB. Leaves entire or only denticulate or crenulate, not lobed, from 

 linear to oblong- lanceolate (or ovate in 75) ; plants varying from 



