Here's a bowl of interesting hardy citrus fruits provided by a Gentleman growing citrus in zone 8 Va Beach, VA.

Included are Karaji Mandarin, Morton Citrange, Thomasville Citrangequat, Honey Changsha, Ventura Lemandarin (open-pollinated taiwanica hybrid), C. taiwanica, Troyer Citrange, and Taiwaniquat.

Of all of them, the Changshas, Taiwaniquat, Thomasvilles and Lemandarin were the best.