No. 459.] ANATOMY OF CATALPA HYBRIDS. II9 
narrowly cylindrical, when adjacent to vessels, usually short cylindrical and 
bearing numerous transversely oval or oblong pits on the radial walls. Ves- 
sels often much shorter than broad, the radial walls with multiseriate, hex- 
agonal pits throughout, the orifice transversely oblong. 
Tangential.— Rays very numerous, low to medium, 1-3 cells wide, some- 
what resinous; the cells chiefly oblong, rather thin-walled, those of the 
extremities much larger and more variable. Vessels with multiseriate, hex- 
agonal or more commonly oval, bordered pits which frequently become 
simple, distant, and transversely oval or oblong. The tangential walls 
of the wood parenchyma with numerous transversely oval or oblong pits. 
Tracheids often devoid of spiral and scalariform structure which is replaced 
by upwards of 3 rows of simple pits. 
The features thus described will be found in the figures of 


tion, X 44. a, very large vessels of the p 
essels of the secondary zone ee apes without “0a 
the greatly reduced and distant vess essels of the summer wood which do not appear 
„the broad zone of the thin-walled jos of the spring 
trach 
Fic. 4.— Cutalpa bignonioides. Transverse sec 
mary zone showing few thyloses ; 5, the v 
wood; e, diagonally radial tracts E spiral and scalariform = connecting with the 
outermost and most reduced vessels; e, tangentially — of tracheids center- 
ing in larger vessel g condary zone. 

the transverse and longitudinal sections. As one of the parents 
of this hybrid is known to be C. kempferi, its diagnosis may be 

