Hill. — On the Roots of Bignonia. 32 7 
roots of i*4 mm. in diameter the depth was about twice 
as great. 
Bignonia capreolata is the only other species which has 
been examined ; its roots do not show the anomalous 
structure of the stem ; and although my material reached 
a diameter of 3 mm. and the outline of the phloem was 
distinctly waved, still there were no indications of the forma- 
tion of sunken phloem. 
The general structure of the root resembles that of Bignonia 
Unguis, the chief differences being the great amount of 
cortical tissue, and the less abundant cortical sclerenchyma 
not grouped together in masses, but in many groups with 
a few fibres each, in this species. 
