236 FUNDAMENTALS OF CYTOLOGY 



This conclusion is supi)orted by ihv, morphology of the chromosomes 

 (page 238). 



Fig. 170. — Somatic chromosome complements of several species of plantains (Plantago) . 

 1, ovata, with 8 chromosomes; 2, Brownii, with 48; 3, major, with 12; 4, japonica, with 3(i; 

 5, alpina, with 24; 6, media, with 24; 7, Raoullii, with 18; 8, lanccolata var. altissima, 

 with 96; 9, serraria, with 10. {After D. McCuUagh.) 



Frequently the sections of a genus show characteristic differences in 

 chromosome number. In Verbena, the section Glandularia with a basic 

 number of 5 includes five diploids with 10 chromosomes and three 

 triploids with 30. In the section Verbenaca, with 7 as a basic number, 

 the Leptostachya group is made up of nine diploids with 14 chromosomes, 



