dodder

To shake or tremble as one moves, especially as of old age or childhood; to totter.

Any of about 100-170 species of yellow, orange or red (rarely green) parasitic plants of the genus Cuscuta. Formerly treated as the only genus in the family Cuscutaceae, recent genetic research by the Angiosperm Phylogeny Group has shown that it is correctly placed in the morning glory family, Convolvulaceae.