116 THE AMERICAN NATURALIST: |. [Vor. XXXIX. 
large as that of C. bignonioides and more than three times the 
size of C. kempferi. The flowers are intermediate in size; in 
color and markings they most nearly resemble those of the 
American species, although a tinge of yellow in the throat of 
the corolla points to their Japanese descent. The fruit of the 
hybrid is almost intermediate in size between those of the two 
parents, as are the seeds, which are perfectly fertile and often 


Fic. 2.— Catalpa kemfferi. Transverse WAREN, x 44. a, vessels of the primary zone iio 
thylos Pe 2 dips espe 

the thyloses; c, vessels of the last of the season's growth; Z, thin-walled cells of the 
spring wood; e, smaller and somewhat thicker-walled cells of the summer wood; J 20 
of spiral and scalariform tracheids limiting the growth ring and showing radial extensions 
in connection with the last small vessels. 
reproduce the original form in every particular. When, how- 
ever, seedlings show a tendency to vary from the original form, 
the variation is generally in the direction of the Japanese rather 
than of the American parent.” 
** The hybrid is a more vigorous tree than either of the Amer- 
ican or the Japanese species, and it grows rather more rapidly. 
