Are the genus Aethionema and Holmskioldia native to the same areas of the world ?
Holmskioldia:  It is native to the Himalayas (India, Pakistan, Nepal, Bhutan, Bangladesh, Myanmar) but widely cultivated as an ornamental and naturalized in many places (Southeast Asia, New Caledonia, Hawaii, Mexico, West Indies, Venezuela, etc.) It contains only one known species, Holmskioldia sanguinea, commonly called the Chinese hat plant, cup-and-saucer-plant or mandarin's hat.
i don't know