con·vol·vu·lus 
(kən-vŏlvyə-ləs)
(kən-vŏlvyə-ləs)n. pl. con·vol·vu·lus·es or con·vol·vu·li (-lī′)
Any of various mostly trailing or twining plants of the widespread genus Convolvulus, having funnel-shaped flowers and including several weeds and a few grown as ornamentals.
[Latin, bindweed, from convolvere, to intertwine; see CONVOLVE.]