190 Cructferaceae 
CC. Mature pods not erect. 
H. Mature pods not pendulous. E. 
A. microphylla Nutt. 
HH. Mature pods pendulous. U. C. 
A. suffrutescens Wats. 
BB.  Stem-leaves not cordate nor eared at base. 
I. Petals pinkish; basal leaves oblanceolate, not lyrate-pinnatifid; seed broadly 

winged. W. A. lyrata occidentalis Wats. (Lyrate Rock-cress) 
II. Petals white; basal leaves lyrate-pinnatifid; seed wingless:) U.C. (A. how- 
ellii.) A. platysperma Gray 
AA. Even the upper stem-leaves somewhat pubescent and the basal leaves also. 
J. Stem-leaves not cordate nor eared at base. 
K. Seed winged or wing-margined. 
L. Leaves all entire; seeds in 2 rows in each cell of the pod. W.C.E. (A. 
purpurascens; A. suksdorfii.) 
A. furcata Wats. 
LL. Lower leaves not entire; seeds in | row in each cell of the pod. E. 
A. cusickij Wats. 
KK. Seed wingless. f 
M. Plant glabrous above, pubescent below with simple or forked hairs. E. 
A. nuttallii Rob. 
MM. Plant wholly stellate-pubescent. E. 
A. whitedii Pip. 
JJ. Stem-leaves cordate or eared at base. 
N. Pod strictly erect. W.C. E. 
A. hirsuta Scop. (Hairy Rock-cress) 
NN. Pod spreading or divaricate. 
O. Basal leaves entire or denticulate. 
Pa'Poeds-1322=327 “cm iong ae 
A. bolanderi Wats. 
PP. Pods 3.7—7.5 cm. long. U. E. ( A. hohleri; apparently A. ar- 
coidea. ) A, breweri Wats. 
OO. Basal leaves dentate. 
Q. Stem-leaves branched, woody. E. 
A. perennans Wats. 
QQ. Stem-leaves simple, herbaceous or nearly so. C. E. (A. secunda; A. 
arcuata; A. sparsiflora secunda.) 
A. sparsiflora Nutt. (Sickle-pod) 
NNN. Pod reflexed or pendulous. 
R. Upper leaves coarsely toothed. U. 
A. subpinnatifida Wats. 
RR. Upper leaves entire. 
S. Basal leaves dentate. W.E. (A. patula; A. retrofracta; A. colum- 
biana. ) A. hoelbellii Horn. 
SS. Basal leaves entire. E. (A. puberula.) 
A, canescens T. & G. 
ERYSIMUM (Cheiranthus) WALL-FLOWER 
Annual or biennial, mainly erect and branching, more or less pubescent or hoary. 
Leaves simple, entire or toothed or lobed. Flowers mostly yellow (so in ours). Stigma 
lobed. Pod elongate, linear, 4-angled or rarely terete; valves strongly keeled by a prom- 
inent mid-vein. Seeds in | row in each cell, oblong, marginless or narrowly margined at 






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