What type of category does Bletilla and Vernonia have in common?
Bletilla Bletilla, common name urn orchid, is a temperate, terrestrial genus of orchids containing five currently recognized species distributed through China, Japan, Taiwan, south to Vietnam, Thailand and Myanmar. The name is actually a diminutive of "Bletia" because of the resemblance between the two genera even though Bletia is a New World genus. The genera Jimensia and Polytoma are generally included into "Bletilla". This genus is abbreviated Ble in trade journals.
Mandevilla Mandevilla is a genus of tropical and subtropical flowering vines belonging to the dogbane family, Apocynaceae. It was first described as a genus in 1840. A common name is rocktrumpet.