Ilial vs Familial - What's the difference?

As adjectives the difference between ilial and familial

is that ilial is (anatomy) pertaining to the ilium; iliac while familial is of or pertaining to human family.

(-)

(anatomy) Pertaining to the ilium; iliac.

(Webster 1913)

(-)

Of or pertaining to human family.

Mark had to leave work due to familial obligations.

(technical) Of or pertaining to any grouping of things referred to as a family.

For Apocynaceae, this type of flower is a familial characteristic.