CAS 



PART III. THE CLASSIFICATION OF PLANTS. 



Order 2. POLEMONIACEJ:. Ovary usually trimerous and trilo- 

 cular, with one erect or several oblique ovules in each loculus : 

 capsule loculicidal : teed with endosperm. Mostly herbs. 



Polemonium cceruleum is Jacob's Ladder ; various species of Phlox and Gilia 

 are common garden plants. Cobaea is a genus of plan.s climbing by means 

 of leaf-tendrils. 



Order 3. SOLANACEJB. Ovary usually consists of two obliquely 

 placed carpels (Fig. 324 />), bilocular, with numerous ovules in 

 each loculus; the axile placentae sometimes project so far into the 

 loculi that the ovary appears to be quadrilocular, as in Datura : 

 ovules campylotropous ; fruit a capsule with various dehiscence, or 

 a berry : seed with endosperm. Herbs, occasionally woody plants, 

 sometimes climbers by irritable petioles (e.g. species of Solanum) ; 

 without milky latex. Inflorescence cymose, but complicated by 



B 



FIG. 448. Stem of FlG. 449. .4 Upper portion of a flowering stem of Atropa 



Cuscittaurop<Ea(s),with Belladonna. B Diagram of the same stem : 1 2 3 the 



inflorescence (J>) twining flowers; a and /3 the bracteoles and bracts. From the 



round a stem of Hop (ar). axils oi spring the new floral axes, along which the bract 



/3 is displaced. 



the displacement of the bracts: Fig. 449 B, for instance, is a 

 diagram of the inflorescence of Atropa ; the main axis which ter- 

 minates with the flower 1, bears a bracteole la and a lateral shoot 

 terminating in the flower 2 ; this springs from the axil of a bract 



