Classification of Plants 



293 



from escaping. The stigmas ripen before the anthers ; by the 

 time the latter are ripe the hairs are 

 withered ; the insect then escapes 

 carrying some of the pollen with it. 

 The flowers are borne along an under- 

 ground rhizome which sends out 

 haustoria into its host plant. 



Cytinus has handsome scarlet 

 flowers with a six-parted perianth. 



The flowers are dioecious. The 

 pollen grains from the numerous 

 anther chambers remain in fours. 

 Found on Eriocephalus (Harvey), Agathosma (Dr. Bolus) 

 Selago (Dr. Kolbe) and other hosts. 



Fig. 264. — Floral diagram 

 of Hydnora. 



Fig. 265. -Hydnora africana, R. Br., parasite on the roots oi Euphorbia, 

 showing underground four-angled stem with tubercles in A, B. Section of flower 

 showing the gland (gl) which secretes an offensive substance attractive to certain 

 carrion beetles ; sta, monadelphous stamens ; sH, stigma ; ov, pendulous ovules. 



Order AizoACEiE (Ficoid^). 



Herbs, usually succulent, with simple petaloid perianth. 

 The ovary may be few- or many-seeded., superior or inferior. 

 The most familiar genera are Mesembrianthemum and Tetragonia, 



