TENDItlL-BEAKEES. 



79 



revolved ; in the latter plant, Dutroehet* saw the movement of 

 the tendril reversed ; but whether the internodes as well as the 

 tendrils revolve in these several species I did not observe. In 

 Anquria Warscewiczii, however, the internodes, though thick and 

 stiff, do revolve : in this plant the lower surface of the tendril, 

 some time after clasping a stick, produces a coarsely cellular layer 

 or cushion, fitting the wood, like that formed by the tendril of the 

 Hanburya :■ ; but it was not in the least adhesive. In Zanonia 

 Indica, which belongs to a different tribe of the family, both the 

 forked tendrils and the internodes revolved, in periods between 

 2 h. 8 m. and 3 h. 35 m., moving against the sun. 



Vitace^;. — In this family and in the two following, namely, 

 the Sapindaceffi and Passifloracea?, the tendrils are modified flower- 

 peduncles ; so that they are axial in their nature. In this respect 

 they differ from those of all the first described families, but 

 perhaps not from those of the Cucurbitacea>. The homologies! 

 nature, however, of a tendril seems to make no difference in its 

 action. 



Vitis vinifera. — The tendril is thick and of great size ; one from 



Fig. 9. 



Tendril of tho Vine. 



A. Peduncle of tendril. C. Shorter branch. 



B. Longer branch, with a scale at its base. D. Petiole of opposite leaf. 



a vine not growing vigorously out of doors, measured 1G inches 

 in length. It consists of a peduncle (A), bearing two branches 



* Comptcs Rendus, torn. xvii. p. 1005. 



