Cuap. III. BIGNONIACE.E. 87 
rather thick stick, and its petioles were brought into 
contact with it, these curved round the stick, showing 
that they have some degree of irritability. The 
petioles also exhibit a slight degree of spontaneous 
movement; for in one case they certainly described 
minute, irregular, vertical ellipses. The tendrils ap- 
parently curve themselves spontaneously to the same 
side with the petioles; but from various causes, it was 
difficult to observe the movement of either the tendrils 
or petioles, in this and the two following species. 
The tendrils are so closely similar in all respects to 
those of B. unguis, that one description will suffice. 
Bignonia unguis.—The young shoots revolve, but 
less regularly and less quickly than those of the last 
species. The stem twines imperfectly round a vertical 
stick, sometimes reversing its direction, in the same 
manner as described in so many leaf-climbers; and 
this plant though possessing tendrils, climbs to a 
certain extent like a leaf-climber. Each leaf consists 
ofa petiole bearing a pair of leaflets, and terminates 
in a tendril, which is formed by the modification of 
three leaflets, and closely resembles that above figured 
(fig. 5). But it is a little larger, and in a young plant 
was about half an inch in length. It is curiously like 
the leg and foot of a small bird, with the hind toe cut 
off. The straight leg or tarsus is longer than the three 
toes, which are of equal length, and diverging, lie in 
the same plane. The toes terminate in sharp, hard 
claws, much curved downwards, like those on a bird’s 
foot. The petiole of the leaf is sensitive to contact ; 
