Davis: THALICTRUMS OF NORTH AMERICA. 511 
C. Akenes at least twice as long as broad. 
D. Plant glaucous throughout; akenes narrowly elliptical, 
tapering at base or stalked. 
E. Divisions of leaves large, crenations broad and shallow. 
peltatum. 
EE. Divisions of leaves small, with small ovate teeth. 
jJaliscanum. 
DD. Plant not at all glaucous; akenes subsessile, one side 
REGAN tac iinleu tee De eae Bei ete Mae SOLE Sa Sharaicicie << A Cuernavacanum. 
CC. Akenes a little longer than broad. 
D. Leaves once or twice ternate; leaflets large, orbicular. 
Pringle?. 
DD. Leaves 4 or 5 times ternate; leaflets small, ovate. 
Guatemalense. 
BB. Leaflets subpeltate on only part of the plant......... pubigerum. 
BBB. Leaflets not peltate nor subpeltate. 
C. Flowers perfect. 
Me See Ena POMONA es... dn suis h wins cevutieds Oeentenle longistylum. 
Ty Ran Sl AO TIOAAG <4 oes here Sa AS ost hm an adic onisat aisle cunieoh an Pachucense. 
CC. Flowers monecious or polygamous (7. jpapzllosum 
doubtful). 
D. Plant glabrous or only glandular, very little or no pubes- 
cence. 
E. Akenes ribbed, not gibbous. 
F. Leaves 4-5 times ternate: leaflets 1 to 2 inches across. 
grandifiorum. 
FF. Leaves 2-3 times pinnate; leaflets small and thin. 
Galeotti. 
EE. Akenes with convex protuberances on the ribs. 
F. Anthers mucronate............. LSE ere Sa Flernandeztt. 
FF. Anthers linear, but rather blunt.::..{...:..... gtbhbosum. 
DD. Plant pubescent, hispid or hairy. 
E. Fruits not woolly. 
F. Leaflets glabrous above, glandular-hispid beneath. 
lanatum. 
FF. Leaflets papillose above; hairy veins prominent be- 
EAU AME eee see see ated Sete emo ee mia na papillosum. 
LOW SAR Sh cea ove || ap Gallas eae Kay ta ep rae Semen ame tomentellum. 
CCC. Flowers diwcious. 
D. Leaves pinnately compounds.iiii.so.s.sscedsnoceedss pinnatum. 
DD. Leaves ternately compound. 
IBY i Slay Meee nee iy ihe facta he asc vo, Clea, Madrense. 
EE. Styles filiform, 3-4 lines long.............. grandifolium. 
