Plate II. — The pollen of the variety Asiatica is abuiulant. it looks 

 "g-Qod" even when examined with a microscope but in the germination tests 

 only a small percentage of the grains is viable. In controlled pollination 

 such pollen occasionally result.s in seed pods. 



St-<'rllitj ill rioiial VarlHlos 



Irises are mostly prop;iK;ite(l as <>loiial varieties. The variety orig- 

 inates as a seedling and then there is continued vegetative propagation 

 by division of rhizomes, bulbs or tubers as the case may be. The entire 

 clonal variety is really one plant whose parts have been separated and 

 grown in different places. In respect to the presence and behavior of 



4 



