648 



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 : seed 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 plants climbing by means 

 of leaf-tendrils. 



Order 3. Solanace^. Ovary usually consists of two obliquely 

 placed carpels (Fig. 324 I)), 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 



Fig. 448. — Stem of 

 Casciita europcea (s), with 

 inflorescence (h) twining 

 round a stem of Hop (x). 



Fig. 449. — A Upper portion of a flowering stem of Atroim 

 Belladonna. B Diagram of the same stem : 1 2 3 the 

 flowers ; a and /3 the bracteoles and bracts. From the 

 axils of /S 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 



