ORDERS 79 
CRUCIFERAS, 
WALLFLOWER. | 
A herb, stem inclined to be woody at its base. 
Leaves: alternate, sessile, exstipulate, simple, lanceolate, 
Margin entire, apex acute. 
Inflorescence: a raceme. 
Flowers : regular and hypogynous 
Calyx (sepals): 2+ 2, free, inferior ; 
the lateral sepals bulge out owing to 
the nectaries on the short stamens. 
Corolla (petals): 4, free, hypogynous, 
crneltorm. 
Andrecaum (stamens): 2+ 2%, free, 
hypogynous; four long, two short 
stamens. Nectaries at base of short 
stamens. | 
Gynecium (carpels) : 2, joined, superior, stigma bifid; style 
much reduced; placentation parietal. 
Fruit, a siliqua. (See Fig. 72.) 
The number of floral leaves in each whorl may be taken as two. 
Type. 

Fre 103. herp at DiA- 
GRAM OF WALLFLOWER. 
This is. ‘clearly 
seen in the calyx. 
In the corolla the 
whorl consists of 
four leaves (pro- 
bably — produced 
by the branching 
of two) in the 
diagonal _ plane 
(Hig. 103)... The 
stamens are in 
Fic. 104.—LoNGITUDINAL SECTION two whorls, the 
- OF WALLELOWER outermost consist- 
ing of the two short stamens, and the innermost of the four 
long stamens, probably derived from a primitive form which 
had but two. The gynecium consists of two carpellary leaves. 

