SECT. II 



PHANEROGAM I A 



651 



with inconspicuous white flowers and hairy seeds which are borne in follicles ; 

 poisonous. Other forms are mostly tropical or sub - tropical. The succulent 

 species of Stapelia, Hoodia, Trichocaulon, etc., which resemble Cactaceae in 

 habit, and inhabit S. African deserts, and Dischidia rafflesiana {*''), the peculiar 

 pitcher plant of the Malayan region, deserve special mention. Hoya carnosa is 

 frequently cultivated. 



Official. — Hemidesmus indicus yields hemidesmi radix. 



Order 5. Tubiflorae 



Flowers pentamerous, actinomorphic, or zygomorphic. Carpels 2. 

 Ovary superior, bilocular, with two ovules, which are frequently 

 separated by a false septum, in each loculus. 



Fig. 688. — Coitfolrulns arvcnsis (j nat. 

 size). Longitudinal section of the 

 flower and a capsule (enlarged). 



Fig. 689. — Exogonium pv.rgo (A nat. size. After 

 Berg and Schmidt). Official. 



Family 1. Convolvulaeeae. — Herbs or shrubs, less commonly 

 trees, with alternate, sagittate, or cordate leaves. The majority are 

 twining plants. Many contain latex. Corolla widely funnel-shaped, 

 only slightly lobed ; in the bud it is longitudinally folded and twisted 

 to the right. Stamens five. Ovules basal in the two or four cavities 

 of the ovary. Fruit a caps ale. 



Generally distributed ; especially in tropical Asia and America. 



