EXOGENOUS OR DICOTYLEDONOUS PLANTS. 



leaves, &c., of the Cabbage and Cauliflower. None are really 

 poisonous plants, although some are very acrid. Several species 

 are in cultivation, for their beauty or fragrance ; such as the Wall- 

 flower and Stock, &c. 



719. Ord, CapparidaceSB (the Caper Family). Herbs, or in the 

 tropics often shrubs or trees ; differing from Crucifera3 in the one- 

 celled pod (which is often stalked) being destitute of any false par- 

 tition ; in the kidney-shaped seeds ; and in the stamens, which, 

 when six, are scarcely tetradynamous, and are often more numer- 

 ous. Ex. Cleome, and Polanisia (Fig. 525-534) ; chiefly tropi- 

 cal or subtropical. Many have the pungency of Cruciferse, but 

 are more acrid. Capers are the pickled flower-buds of Capparis 



FIG. 525. A Cruciferous flower. 526. The same, with the calyx and corolla removed, show- 

 ing the tetradynamous stamens. 527. Siliques of Arabis Canadensis ; one of them with one of 

 the valves detached, showing the seeds lying on the false partition; the other valve also falling 

 away. 523. A magnified cross-section of one of the winged seeds, showing the embryo with 

 the radicle applied to the edge of the cotyledons (cotyledons decumbent). 529. The embryo 

 detached. 530. The raceme of Draba verna, in fruit. 531. A cross-section of one of the sili- 

 cles, magnified, exhibiting the parietal insertion of the seeds, and the false partition. 532. A 

 silicle of Shepherd's Purse (Capsella Bursa Pastoris). 533. The same, with one of the boat- 

 shaped valves removed, presenting a longitudinal view of the narrow partition, &c. 534. A 

 magnified cross-section of one of the seeds, showing the embryo with the radicle applied to the 

 side of the cotyledon (cotyledons incumbent). 



