178 TENDRIL-BEARERS. Cuar. IV. 
the stem of B. capreolata twines imperfectly ; the much- 
branched tendrils revolve in a capricious manner, and 
bend from the light to the dark; their hooked ex- 
tremities, even whilst immature, crawl into crevices, 
and, when mature, seize any thin projecting point; 
in either'case they develop adhesive discs, and these 
have the power of enveloping the finest fibres. 
In the allied Eccremocarpus the internodes, petioles, 
and much-branched tendrils all spontaneously revolve 
together. The tendrils do not as a whole turn from 
the light; but their bluntly-hooked extremities arrange 
themselves neatly on any surface with which they 
come into contact, apparently so as to avoid the light. 
They act best when each branch seizes a few thin 
stems, like the culms of a grass, which they after- 
wards draw together into a solid bundle by the spiral 
contraction of all the branches. In Cobea the 
finely-branched tendrils alone revolve; the branches 
terminate in sharp, hard, double, little hooks, with 
both points directed to the same side; and these turn 
by well-adapted movements to any object with which 
they come into contact. The tips of the branches 
also crawl into dark crevices or holes. The tendrils 
and internodes of Ampelopsis have little or no power 
of revolving; the tendrils are but little sensitive to 
contact; their hooked extremities cannot seize thin 
objects; they will not even clasp a stick, unless in 
extreme need of a support; but they turn from the 
light to the dark, and, spreading out their branches in 
contact with any nearly flat surface, develop discs. 
