Cruciferaceae 177 
GG. Pod dehiscent; seeds usually more numerous. 
H. Pod beakless or the beak very short and thick. 
I. Seeds flat, in 2 rows in each cell; leaves lyrate-pinnatifd. 
BARBAREA (p. 184) 
II. Seeds not flat, in | or 2 rows in each cell; leaves not or hardly lyrate- 
pinnatifid. 
J. Pod either 3.5 cm. or more long, or else almost sessile and quite 
rigidly erect-appressed. SISYMBRIUM (p. 183) 
JJ. Pod less than 2.5 cm. long, distinctly pediceled, not rigidly erect- 
appressed. 
K. Pubescence of forked hairs. Roripa (p. 184) 
KK.  Pubescence of simple hairs or none. SISYMBRIUM (p. 183)’ 
HH. Ped with an abruptly slender or a flat beak at least 1% as long as 
the fertile portion. Brassica (p. 183) 
AA. Petals either none cr of some color other than yellow. 
L. Leaves ternately- or palmately-lobed or -laciniate or -divided. 
'  DENTARIA (p. 186) 
LL. Leaves pinnately-toothed to -compound, or entire and pinnately-veined. 
M. Pod borne on a stipe | cm. or more long. STANLEYA (p. 179) 
MM. Pod without a stipe or with a very short one. 
N. Some of the leaves pinnatifid. 
C.  Stem-leaves all pinnatifid. 
P. Pod indehiscent, not longitudinally 2-celled. RAPHANUS (p. 184) 
PP. Pod dehiscent, longitudinally 2-celled. 
Q. Pod terete, |—16 mm. long; plants of ditches. (See K.) 
QC. Pod flattened parallel to the partition, 12—31 mm. long; mostly 
not ditch plants. CARDAMINE (p. 185) 
QQQ. Pod flattened at right angles to the partition, 6—10 mm. long; 
plants of rather dry places. SMELOWSKIA (p. 189) 
OC. At least the leaves of the upper half of the stem entire or merely 
toothed or serrate. 
R., Pod 3 cm. or less long. ARABIS (p. 189) 
RR. Pod 3.5 cm. or more long. 
S. Petals undulate-crisped, but little longer than the sepals, the 
blade merely a wide extension of the claw. CAULANTHUs (p. 180) 
SS. Petals plane, much longer than the sepals or else the blade well 
developed. THELYPODIUM (p. 179) 
NN. Al of the leaves from entire to shallowly lobed, none pinnatifid. 
T. Mature pod 2.5 cm. or less long. 
U. Pod flattened parallel to the partition. 
V. Leaves all petioled; valves veinless. (See QQ.) 
VV. Stem-leaves sessile. 
W. Valves of the pod veinless; stem-leaves not clasping. 
DRABA (p. 187) 
WW. Valves I-veined; stem-leaves clasping in most species. 
ARABIS (p. 189) 
UU. Pod terete or angular or hardly flattened. 
X. Plant glabrous. 
Y. Pod 2-celled by a transverse constriction, indehiscent. 
CAKILE (p. 183) 
YY. Pod 2-celled by a longitudinal wall, dehiscent. 
: THELYPODIUM (p. 179) 

