INTROGRESSION IN IRIS 



Plate 1. Below: Flowers and enlarged sepals of Iris fulva (left) and Iris 



hexagona var. giganti-caerulea (right) to the same scales. Above: Map of 



area where these two species were hybridizing. H-1 and H-2 are the 



hybrid colonies diagrammed in Figs. 22 and 21, respectively. 



