DICOTYLEDONS : METACHLAMYDEAE 255 



which are derived from the roots, leaves, or seeds of the 

 plants after which they have been named, namely Atropa 

 Belladonna (Deadly Nightshade), Nicotiana spp. (Tobacco), 

 and Hyoscyamus niger (Henbane). The latter is common 

 in waste places in Britain ; and occasionally in such places 

 is found the poisonous Thorn-apple (Datura Stramonium). 



The ' Tea-tree ' (Lycium chinense) is frequent in hedge- 

 rows but, unlike the Bittersweet, is not a native of Britain. 



e 



Fig. 173. Floral Diagram of Woody Nightshade. 



Cayenne pepper is obtained from pods of species of 

 Capsicum. Some fruits are edible, e. g. Tomato (Solanum 

 Lycopersicum). The Mandrake (Mandr agora officinalis), 

 connected with which are so many strange superstitions, 

 also belongs to this order. 



Order Scrophulariaceae. Flowers zygomorphic, very 

 variable ; sepals five, united. Petals five, united, often 

 two-lipped. Stamens four, two long and two short 

 (didynamous), sometimes only two, epipetalous. Pistil 

 of two carpels, superior, syncarpous. Ovary two-celled, 

 style terminal (Fig. 174). 



