54 



ui It. 



by dissepiments (yo, c) into many cells. The central pillar, or 

 substance formed by the united placenta is called the colu- 

 mella. To tliis the seeds are generally attached. The seed- 

 vessels of the ^Lobelia, mullein, pink, poppy, bloodroot\(San- 

 giiinaria), are capsiiles. 



FIG. 17. — Forms of fruit: 1, capsule of Rhododendron; 2, Nicotiana; 3, Colchicum ; 

 4, CEnothera; 5, silique of Raphanus ; 6, silicle of Gapsella ; 7, legume of the pea; 8, jointed 

 legume (loment) of Desmodium ; 9, follicle of Apocynum ; 10, nut of oak ; 11, drupe of 



Cerasus. 



2. Silique (a pod). This is a long, narrow pericarp of two 

 valves, divided into two cells, by a false dissepiment formed by 

 the extended placenta3. The seeds are attached to the edges 

 of this dissepiment, alternating with its opposite sides. Ex. 

 mustard, wallflower," and other Cracifera^. 



3. Silicle (a little pod), differs from the silique, by being 

 shorter, and more nearly oval. / Ex. pepper-grass, shepherd's 

 purse (Thlaspi). The silique and silicle are peculiar to plants 

 with cruciform corollas. 



4. Legume (also a pod)v two-valved, one-celled, consists of a 

 simple carpel, and thus differs essentially from the silique. It 

 bears its seeds attached to the margin of each valve alternately, 

 along the ventral suture only. Ex, pea, and all other plants of 

 the great natural order LeguminoscC. " The legume, therefore^ 

 accompanies the papilionaceous corolla. 



5. Follicle (a bag) is a pericarp with one valve and one 



