106 POPULAR FIELD BOTANY. 
Erysimum Arrtaria. (Plate V. Fig. 20.) Garlic treacle 
Mustard. Besides this English name it has others which 
are rather droll: Jack-by-the-hedge is one; but how such a 
name could have arisen is difficult to imagine. Sawce alone 
may be derived, from its possessing a smell of garlic. It is 
an early plant, and having very handsome leaves makes the 
hedges look gay where it abounds. They are broadly heart- 
shaped, stalked, and of a bright green. Stem from one to 
two feet high, flowers numerous, white and small. When 
bruised it emits a smell like garlic; it is bitter and acrid, 
and is said to have been used as a salad. It grows by 
hedges, walls, and amongst rubbish, and is very common. 
eee 
TETRADYNAMIA. SILIQUOSA. 
THALAMIFLOR2. CRUCIFERZ. 
CHEIRANTHUS. (Watt-FLOWER.) 
Generic Character, Calyx with two sacs at the base. Pod 
taper, and two edged. 
Our garden plant of this genus familiarizes us with the 
wild specimen (Cheiranthus chew), and the young botanist 
may find it flowering in this month, and the following, par- 
