Mandarinquat
The mandarinquat, also misleadingly called orangequat, is any cross between a mandarin and a kumquat. Mandarinquats are members of the citrofortunella group.
The variety Nippon orangequat was first introduced in 1932 by Dr. Eugene May of the USDA... Wikipedia
Hybrid parentage: Citrus 'Satsuma' × Fortunella 'Meiwa'