402 DICOTYLEDONES. 



3. Siliqua (Siliquosse). The fruit is a true siliqua, several 

 times longer than broad. The seeds in -most are borne apparently 

 in one row. 



O^>x > : Brassica (Cabbage). The seeds are placed apparently 

 in one row in each loculus (Fig. 398 (7) ; the style is long and round; 

 the valves have only 1 strong, longitudinal rib. Melanosinapis (M. 



FIG. 401. Transverse section of a silicula FIG. 405. Transverse section of ft 



with broad replum : s replum j fc the valves. silicala with narrow replum. 



nigra, Black-mustard) ; the style is compressed, two-edged; the 

 valves of the siliqua are one ribbed. Sinapis (Mustard) ; quad- 

 rangular or flat style (in which in most cases there is a seed) and 

 3-5 strong, longitudinal ribs on the valves. Eruca differs from 

 Brassica by the shorter siliqua, broad, sword-like " beak " and 

 seeds in two rows. 



O= (Fig. 399) : Cardamine (Bitter Cress) has a long, linear 

 siliqua, with flat, unribbed, elastic valves. The leaves are most 

 frequently pinnatifid or pinnate. C. pratensis reproduces by buds 

 formed in the axils of the leaves. Arabis (Rock Cress) ; Matthiola 

 (Stock); Cheiranthus cheiri (Wallflower); Barbarea (Winter Cress) 



FIG. 406. Thlaspi arvense. FIG. 407. Silicula of Capsella lursa-pastoris. 



(double-edged, quadrangular siliqua) ; Nasturtium (N. officinale y 

 Water-cress) ; the siliqua of the latter genus is in some species 

 short, in others long. 



O || (400) : Sisymbrium (Hedge Mustard) the valves of the 

 siliqua are 3-ribbed. Erysimum ; Hesperis ; Schizopetalum (with 

 fimbriate petals). 



