20 Vnivernitji of Califoniid I'nhlirnliniis in Auricnll nrat Hciences | \'ol. 2 



new form and in considerable vjiriclx. especially the flowers, 

 iiiiiny of which do not mature into fruits. Bisexual flowers are 

 rather frequent and. whether bisexual oi- not. the flowers often 

 have i)eculiar external markings on the ovarv resemblin<i- those 

 already noted in the teratolotjical flowers above described. 



'■\. Lair flowers, i.e.. aljiiornud catl<ins on second-fjrowth wood, 

 have been ol)served on t'oiw ol' the seven original trees of the 

 new form examined by the writer. The other three trees sekhmi 

 l)eai" any flowers. Specimens of these abnormal catkins collected 

 from the Leiifinsiwell original tree in 1909 are shown in plate 11, 

 figure 17. From the size of the normal young fruit shown at a, 

 the difference in time between the normal blooming period and 

 the appearance of these abnormal catkins may be inferred. The 

 flowers on these abnormal catkins are very small and abortive and 

 the leaves, shown at a, b, c, and d, resemble the leaves shown at 

 d, e, and /' in plate 9, figure 14, which were associated with 

 abnormal catkins on indigenous Juglans calif arnica trees. 



4. There is no apparent obstacle to the natural pollination oi 

 the late-appearing teratological flowers, as some of them are 

 bisexual and free pollen has been observed in these ))isexual 

 flowers. Also a few late staminate catkins have l)een found. 

 Moreover, there is wide variation in the normal ])looming period 

 among individual, indigenous trees. The young fruits of difTerent 

 trees have been oljserved to vary in size from nearly full-grown 

 down to five-eightlis of an inch in diameter. It is possible, then, 

 that the normal pollen produced on late trees might fertilize ab- 

 normal flowers on early blooming individuals. However, in the 

 test for apogamic development of normal tViiits it would l)e 

 interesting to test these teratological flowers also. 



The reasons for not thinking the new variety oi-iginated in 

 late teratological flowers are as follows : 



1. Sixty-eight seedlings have been mown fidin teratological 

 nuts and none have resembled the new t'oriu. 



2. Th(^ new form is k'nowii to have been pi'odnccd by nuts 

 of nonnal size and shape. 



From the data at hand, the writer is inclined to consider the 

 second hypothesis as approaching more nearly to the truth flian 

 the flrsf. but thus far direct evidence fails to su])poi't it. 



