4 University of California Publications in Agricultural Sciences [Vol. 2 



same age as Disher's is usually rough, the bark on these trees is 

 rather smooth. 



The left-hand tree in plate 1, figure 1, always produces both 

 male and female flowers and frequently bears abnormal bisexual 

 flowers also. But the other tree produces only staminate cat- 

 kins, and the photograph shows in what profusion they are borne. 

 A very few pistillate flowers have been seen on this tree, but it 

 has never been known to bear fertile seeds. That sterility in this 

 individual is associated with greater vigor in wood production is 

 shown in the above figure. The leaves on some specimens of 

 the new form are highly variable. The common type of leaf, 

 however, is one with a terminal leaflet one or two inches long 

 and two smaller lateral leaflets, as shown in plate 2, figure 2, a. 

 Sometimes both lateral leaflets are missing and occasionally only 

 one is present, as shown in plate 2, figures 2, h and c, and in plate 

 3, figures 4 and 5. Plate 2, figure 2, is approximately natural 

 size. In order to appreciate the remarkable difference in leaf 

 characters between the new form and Jiiglans californica note 

 the leaves in plate 7, figure 11. 



The frequent occurrence of ascidia (pitchers) on the leaves 

 of the Leffingwell "original" tree gives further evidence of the 

 tendency toward extreme variation. Not being aware that ascidia 

 have been reported previously in the genus Juglans, I give plate 

 2, figure 3 a photograph of four leaves bearing ascidia and one 

 normal leaf. 



The nuts borne on Disher's original fertile tree resemble those 

 of southern California black walnuts in external appearance of 

 the husk (cf. plate 2, figure 2). Their average size is much 

 smaller. The immature fruits are also similar, except that many 

 of them are ridged or grooved as in plate 3, figure 4, a, and 

 figure 5, a, while some depart widely in appearance from the 

 typical young fruit of Juglans californica. Such a specimen is 

 shown in plate 3, figure 5, h. The smooth area surrounding the 

 stigma was proportionately large, and tapering arms extended 

 towards the base. Surrounding the stigma were several small 

 protuberances, apparently remnants of anthers. The occurrence 

 of bisexual flowers on this tree has been mentioned. When the 

 dry husk is removed from the mature nuts of this tree, they are 



