178 Cruciferaceae 
XX. Plant more or less pubescent with branched hairs. 
Z. Flowers in a globular head. BrayA (p. 191) 
ZZ. Flowers in an elongated raceme. STENOPHRAGMA (p. 192) 
TT. Mature pod more than 2.5 cm. long. 
a. Pod strongly flattened parallel to the partition. 
b. Valves of the pod veinless. é STREPTANTHUS (p. 180) 
bb. Valves 1-veined. 
c. Seed winged; leaves only rarely densely tomentose on both sides. 
ARABIS (p. 189) 
cc. Seed not winged; leaves densely tomentose on both sides with 
fine stellate pubescence. ParrRYA (p. 191) 
aa. Pod terete or angular or only very slightly flattened. (See WW.) 
GROUP 2 (with short pods) 
A. Flowers yellow. 
B. Pod flattened parallel to the partition. 
C. Pod orbicular; seeds 2 in each cell of the pod. ALYSSUM (p. 191) 
CC. Pod elliptic to oblong; seeds 3 or more in each cell. DrRaBaA (p. 187) 
BB. Pod flattened at right angles to the partition. 
D. Leaves spatulate; cells of the pod much inflated and appearing like twin 
pods. PuHysariaA (p. 186) 
DD. Leaves sagittate-clasping; cells of the pod not inflated; pod obovoid. 
CAMELINA (p. 187) 
BBB. Pods terete. 
E. Pod indehiscent, globose, 1-celled, 1——2-seeded. NESLIA (p. 187) 
EE. Pod dehiscent, oval to cylindric, 2-celled, several- to many-seeded. 
F. Pod oval or obovate; leaves entire to wavy. LESQUERELLA (p. 186) 
FF. Pod oblong; in nearly all species some of the leaves pinnatifid. 
Roripa (p. 184) 
AA. Flowers not yellow, petals often none. 
G. Pod indehiscent, orbicular, flattened, 1-celled, |-seeded. 
H. Pubescence branched; pod not wing-margined. ATHYSANUS (p. 188) 
HH. Pubescence simple; pod wing-margined. THYSANOCARPUS (p. 188) 
GG. Pod dehiscent, various in form, often flattened, 2-celled, more than |-seeded. 
I. Pod terete. CocHLEARIA (p. 182) 
IT. Ped flattencd parallel to the partition. 
J. Seeds 4 or mere in each cell of the pod. 
k..  Floweis solitary, on scapose stems; seed broadly winged. 
PLATYSPERMUM (p. 186) 
KK. Flowers in racemes, often on scapose stems; seed wingless. 
DraBa (p. 187) 
JJ. Seed 1 in each cell of the pod. LoBuLaRIA (p. 191) 
III. Pod flattened at right angles to the partition. 
L. Pod lanceolate or oblong-lanceolate. SMELOWSKIA (p. 189) 
LL. Pod shorter for its width. 
M. Valves of the pod obtusely keeled or rounded on the back. 
N. Pod warty-wrinkled or -tubercled, 2-seeded. CoRoNOPUS (p. 182) 
NN. _ Pod not as above, many-seeded. 
O. Pod obcordate or triangular-obovate, much flattened, notched at apex. 
CAPSELLA (p. 187) 
OO. Pod ovate or elliptic, not much flattened, not notched at apex. 
P. Leaves entire, awl-shaped; aquatic; seeds few. 
SUBULARIA (p. 181) 


