cies, as in £7. heterophyllum and EB. Lemmoni. Extensive 
polyploidy, particularly in the Americas, has arisen on 
the basic complement of 8 (7 =16, 24, 82, 40, 48), and 
smaller series based apparently on 7 in Eurasia. 
LITERATURE CITED 
Constance, L., IT. 1. Chuang and C.R. Bell. Chromosome numbers in 
Umbelliferae V. Amer. Jour. Bot., in press. 
[ 246 | 
