1906 



A TEXTBOOK OF THEORETICAL BOTANY 



and more particularly in the United States, Cuba, Sumatra, Egypt and 

 Brazil. Other species, including A^. rustica, are also grown. Different 



Fig. 1826. — Nicotiana tabaciim. Flowers illustrating 

 pollination. See in text. 



varieties of N. tabacum are used in the preparation of cigar, pipe and 

 cigarette tobacco, A^. ritstica being now chiefly employed as a source of 



Fig. 1827. — Schizonthus ivisetouensis. 

 Garden forms which are hybrids of 

 S. pinnatus and S. grahami. 



