XXVI. NATIVE AND CULTIVATED RANUNCULI OF 
NORTH AMERICA AND SEGREGATED GENERA. 
K: €2 Davis: 
Few groups of plants are perhaps less understood than this 
one. The range of variation in characters is rather limited and 
yet the number of species is very great. Six genera have taken 
from Feanunculus about thirty-six species and yet that genus re- 
tains more species than any other of the order Ranunculaceae. 
About 350 names have already been given to American plants 
of this group. 
Kry To GENERA. 
A. Akenes transversely wrinkled; roots fibrous; aquatic or ditch 
AEE RIVETS WUTIIE Ce isc as aes ame nnssanuatecwagesave oonseteeae Batrachium. 
AA. Akenes not transversely wrinkled. 
B. Developed carpels not longitudinally ribbed or striated. 
C. Roots not acluster of thickened tubers, or several times longer 
than thick. 
D. Flowers mostly yellow or white; akenes compressed, never 
lanceolate, smooth, papillose or spiny............. Ranunculus. 
DD. Flowers white; akenes lanceolate, utricular; style hooked. 
Kumlienia. 
CC. Roots a cluster of thickened tubers; leaves crenate, cordate; 
eetyledow. ONLY «1 tien Jacsteqateows=sbeshie sade sata ene Ficaria. 
BB. Developed carpels longitudinally ribbed or striated. 
C. Leaves pinnately compound or lobed; akenes terete, style 
Persistent, slender, recurved: 3. waite eye easnt seat Cyrtorhyncha. 
CC. Leaves not as above; akenes compressed. 
D. Akenes with beaks somewhat reflexed; leaves rounded and 
TOOU og c20 apeedenen te oc aves susies fede eue ante on Gras Arcteranthis. 
DD. Akenes minutely sharp-pointed; leaves crenate-dentate, 
ayal-cordate fo, FEMitOrml..gs sass. odie es Geena: mane’ Oxygraphis. 
