Chm Plants\rarely over 30 cm. tall; basal 
jo pubescence wanting; pods 4-6 om. long 8, Ae Lyallii 
12, Arabis Le 
biennial 
see perennial herbs commonly with oblanceolate leaves in a basal 
tuft and auricled cauline leaves. Sepals erect, frequently purplish, the 
lateral pair more or less gibbous at the base. Petals more or less spatulate 
usually about twice the length of the calyx and somewhat spreading, white or , 
purples Stamens without appendages. Pods linear, strongly compressed parallel 
to the partition, cammonly with a midvein in each valvee Seeds very flat, | 
disc-shaped, usually with a margin or narrow wing ( in our species). 
0 Stem leaves tapering at the base, not auricled; 
4 pods 10-20 mm. long |. Ae Nuttallii 
. 
9 Stem leaves auricled, more or less clasping the 
4 stem; pods 4-10 om. long 
2, Stems glabrous or pubescent only at the very base 
Stem leaves 5-6 cm. long; pods 6-8 cm. long, 
R 1.2-1.5 mm. wide, ‘subcylindrical 2. Ae glabra 
~—_ 
Stem leaves 3-5 cm. long or less; pods 4=7 om. 
long, 1.5-2.5 mm. wide, strongly flattened 
Plants 40-60 cm. tall; basal pubescence 
IOsparse but distinct; pods 6-7 cm. long “4. A. Drummondii j 
. Stems and leaves more or less pubescent at least in the 
‘~  ( lower parts 
A Pods strictly erect; corolla whitish SY Ae hirsuta 
4 Pods spreading, reflexed or pendulous, not 
erect 
o bir wtherl, ; 
 Plents thinly villous with simple or stettete hairs; , 
pods spreading, lightly curved; corolla rose- par 
At 
< wa 
10 pul ple 
= 
f i” 
Claw thied ssaaens ; 
¢ 
({, Plants finely wrokrese— pubescent ; pods strongly 
= rerlexea or pendulous, straight; corolla 
es 
JO\ white or pinkishs ? ) 
bts y Plants 50-00 cm. tall, basal leaves in aro) etrofracta i 
“f sette;the couline baad >_< / "| Ae ll 2G ect am 
AS \ * ‘ ee me 
{/~ ee —— | 
a : 
