LYCOPERSICUM ESCULENTUM 



553 



greenhouse culture. This is especially helpful in experimental 

 work of a genetic character, such as that carried on by Lindstrom 

 and Koos (ii), where it is essential to perpetuate the plant without 

 modification of the genetic pattern. They were able to propagate 

 for five years without mutation or change a haploid (ii chromo- 

 somes) tomato plant which arose spontaneously in an Fo generation. 

 The arrangement of the leaves is usually alternate with a Jr^ 

 phyllotaxy. They are odd-pinnately compound, the number of 



Fig. 191. The plant showing sympodial branching. 



larger leaflets ranging from seven to nine, rarely eleven; and, 

 between the adjacent pairs of major leaflets, a variable number of 

 smaller ones occur. In the smaller varieties, there may be from 

 four to six intermediate leaflets, and as many as nine to eleven occur 

 in the larger, more vigorously growing types. The margins of the 

 leaflets are variously incised or lobed except in Lycopersicum escu- 

 lentum, var. grandifolium, in which they are entire. Capitate 

 glandular hairs and large pointed non-glandular ones occur as on 

 the stem. (Fig. 191, E.) 



The short petioles are relatively constant in length, ranging 

 from i}<t to 2.^2 inches, and the compound blade is approximately as 



