THE 
AMERICAN NATURALIST. 



Vor. XXXIX. March, 1905. No. 459. 

THE ANATOMICAL CHANGES IN THE STRUC- 
TURE OF THE VASCULAR CYLINDER INCI- 
DENT TO THE HYBRIDIZATION 
OF CATALPA. 
D. P. PENHALLOW. 
In 1889 Prof. C. S. Sargent published an account of an inter- 
esting and newly observed case of hybridization between two 
species of Catalpa which he designated as Catalpa x J. C. Teas 
in reference to the origin of the tree in the nursery of Mr. Teas 
at Carthage, Missouri! The account referred to states that 
Catalpa kempferi was planted in 1864 in a nursery containing 
C. speciosa and C. bignonioides. Eventually the first species 
produced a single pod of seeds which were wholly unlike any- 
thing hitherto known. When these seeds were planted, they 
produced a tree almost intermediate in character between C. 
kempferi and one of the ‘American species. Mr. Teas was of 
the opinion that the cross was with C. speciosa, while Prof. 
Sargent considered C. bignonioides as the other parent, basing 
his conclusion upon the fact that C. speciosa flowers two to 
three weeks earlier than C. Aampferi, while the flowers of C. big- 
1 Garden and Forest, vol. 2, 1889, p. 303- 
113 

