× "Chionoscilla" is the genus name used for hybrids between the two closely related genera "Chionodoxa" and "Scilla".
Aichryson is a genus of about 15 species of succulent, subtropical plants, mostly native to the Canary Islands, with a few in the Azores, Madeira and Morocco, and one in Portugal.
Chionodoxa, known as glory-of-the-snow, is a small genus of bulbous perennial flowering plants in the family Asparagaceae, subfamily Scilloideae, often included in "Scilla".
 The genus is endemic to the eastern Mediterranean, specifically Crete, Cyprus and Turkey.
 The blue, white or pink flowers appear early in the year making them valuable garden ornamentals.
 The common name of the genus is based on the habit of flowering in high alpine zones when the snow melts in spring.

Question: Aichryson and Chionodoxa, are a genus of what?
Answer: plants