Variety names are given when the
mutationoccurs in nature. The abbreviation var. is used to
signify that the mutation is a variety. var. is placed after the
specific epithet and is not underlined or italicized.
How to write:
1. The variety name is written after var.
2. Capitalize the first letter of the variety name only if it is
a proper noun.
3. Underline or italicize the variety name.
Example: Mammillaria lasciacantha var.
lasciacantha var. egregia)