Crucifer—Chetranthus. 45 
scription nor recommendation. The varieties it has given birth 
to are innumerable. Yellow, orange, purple, brown, and 
variegated single and double flowers occur. The Rocket 
Wallflowers form a distinct race, with long narrow flower- 
spikes. Though probably not indigenous, 
it is now found in many parts of Britain. 
The figure is more characteristic of the 
wild than the cultivated form. 
2. Ch. Marshallii, syn. Erysimum.— 
A dwarf shrubby plant with evergreen 
leaves and a profusion of large fragrant 
orange-coloured flowers. It continues in 
‘flower from April till July. Supposed to 
be of hybrid origin, between the common 
Wallflower and Ch. alpinus. 
3. Ch. alpvnus.—A dwarf species about 
6 inches high, with remotely toothed leaves 
and an abundance of pale yellow flowers. 
Summer. Mountains of Europe. 
3. ARABIS. 
Annual or perennial herbs, often with 
large rosettes of leaves, glabrous or hairy. 
Radical leaves spathulate, cauline sessile. 
Flowers white, more rarely purple. Pod 
linear, compressed, keeled, not elastic; 
seeds compressed in 1 or 2 series. ,. 
Species numerous, chiefly from the tem- Mei 
perate and arctic regions of the northern i 
hemisphere. The name is from Arabia, Pie: 39. (heizanthus Chelrt. 
the native country of some species. 
1. A. albida, syn. A. Cancdsica.— Very common in old gar- 
dens, and a very hardy Spring flowering plant. It grows 
in patches with slender running stems and rosettes of pale 
green spathulate toothed leaves clothed with greyish hairs. 
Flowers pure white, in elongating racemes on leafy erect stems. 
There is a very pretty variegated variety. Mediterranean re- 
gion, ete. A. alpina is probably an alpine form of this species. 
2. A. blepharophiylla.cSimilar to the preceding in habit 
and foliage, but with rosy-purple flowers. From California, 
but not yet very widely spread in gardens. June. 
3. A. lucida.—This species has dense rosettes of glabrous 
shining sessile spathulate leaves and very small white flowers. 
