512 



BOTANY OF THE LIVING PLANT 



Gynoecium, carpels 8-12, syncarpous, superior; the stigma sessile, star- 

 shaped ; the rays of the star indicate the number of the carpels. The ovary 

 is unilocular : beneath each ray of the stigma (that is, at the junction of 

 the carpels that compose it) a flat partition extends radially towards the centre, 

 but without reaching it. In others of the Poppy family the carpels may be 

 fewer, and in Chelidonium only two, as in the Cruciferae. The small and num- 

 erous ovules are borne superficially on these plates. Fruit, a dry capsule 

 opening by pores below the stigma. Seeds with oily endosperm : they are 

 scattered out by wind shaldng the pore-capsule (see Fig. 231, p. 289). 



Red Poppy {Papaver rhueas, L.) I. Rower and biidi, with sepals falling a\va\'. 

 11. flower in median section. 111. gynoecium. IV. ripe fruit, with dehiscent pores 

 below the star-shaped stigma. V. floral diagram. 



Pollination. The showy flower attracts insects, which come to collect 

 pollen. There is no honey, and the flower is radial : it is not a highly special- 

 ised type. Promiscuous cross-pollination may follow from insect visits, but 

 self-pollination is also possible. Papaver soinniferiiut, L., the Opium Poppj', 

 belongs to the family. 



Family: Crucifer.\e. Example: The Charlock. 



(19) The Charlock, or Field iVIustard [Brassiea sinapis, ^'isiani), is the 

 common weed that colours cornfields yellow in early summer. It is an 

 annual, with stem and leaves bristly with stiff hairs. Its germination is 

 shown in Fig. 3, p. 10. Its inflorescence is a raceme, but with the bracts 

 abortive (Fig. 219). The flower, which is of radial symmetry, consists of : 



Calyx, sepals 4, polysepalous, inferior ; in two pairs, the outermost being 

 antero-posterior, the inner lateral. 



