642 



BOTANY 



(Nymphaeaceae), occurrence of trimerous flowers in Bocconea (Berberidaceae), the 

 stigmas situated directly above the carpels and the occasional occurrence of an apo- 

 carpous gynaeceum (e.g. Platy- 

 stemori). The increase in number 

 of stamens is brought about by 

 chorisis ; they are cyclic. The 

 seeds have abundant endosperm. 

 Chelidonium majus, Celandine, 

 has yellow latex and a bicar- 

 pellary ovary. A number of 

 species of Escholtzia, Argemone, 

 and Papaver are cultivated as 

 ornamental plants. Papaver 

 Rhoeas, the Poppy (Fig. 652), 

 is a common weed in corn-fields 

 or dry meadows. The bent posi- 

 tion of the flower-bud is char- 

 acteristic of many Papaveraceae. 

 Papaver somniferum, which is of 

 oriental origin, has abundant 

 white latex. The plant has a 



FIG. 651. Floral diagram of Glaucium 

 (Papaveraceae). (After EICHLER.) 



FIG. 653. Floral diagram of Corydalis 

 cava. (After EICHLER.) At the 

 base of the stamen standing above 

 the spnr is a nectary. 



FIG. 652. Papaver Rhoeas. ( nat. size.) OFFICIAL. 



glaucous bloom and, except on the flower-stalks, which bear a few bristly hairs, 

 is glabrous. Leaves sessile, margin irregularly serrate or lobed. Petals violet or 

 white with a dark patch at the base. Ovary unilocular, incompletely septate by 

 the projection inwards of the numerous placentas. Fruit ripens erect on the 



