176 swingle: a new genus of kumquat oranges 



and for having a relatively thick, sweet, and edible peel. These 

 diminutive fruits, borne on correspondingly dwarfed trees or shrubs, 

 have been found to possess in very high degree winter dormancy, which 

 is so essential to hardiness in citrous fruits grown in the variable cli- 

 mate of Florida and the Gulf States. Recently the kumquat oranges 

 have also been found to be remarkably resistant to citrus canker, the 

 most dreaded of all the diseases affecting citrous trees in the United 

 States. Indeed, many investigators have not succeeded in finding 

 any canker infection on kumquat oranges, and believe them to be 

 immune. Furthermore, hybrids between the two commonly culti- 

 vated species of kumquat, the oval and the round-fruited, on the one 

 hand, and the common lime on the other, have proven not only to be 

 very resistant to cold, but to possess a considerable degree of resist- 

 ance to citrous canker. 



