What type of category does Echium and Oxydendrum have in common?
Echium Echium is a genus of 60 species of flowering plant in the family Boraginaceae.
Ophioderma pendulum Ophioderma pendulum is sometimes known as the old-world adder's-tongue. In Malaysia, it is known as daun rambu. It is a fern in the family Ophioglossaceae, and is the type species of the genus "Ophioderma".