Fig. 3. Effect of extracts from 'Mammoth' tobacco leaves on the growth anci 

 flowering of Rudbeckia. A, extract from leaves of long-day plants; B, extract from 

 leaves of short-day plants; C control, water. 



Fig. 4. Effect of extracts from Rudbeckia leaves on growth and flowering of 

 Rudbeckia. A, extract from leaves of long-day plants; B, extract from leaves of 

 short-day plants; C, control, water. 



