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.
Epidendrum cylindraceum Epidendrum cylindraceum is a reed-stemmed "Epidendrum" of the Orchidaceae, native to Colombia, Ecuador, and Peru, where it has been reported at an altitude of 3.2 km.