Yes that is true, if seeds are fresh, in 2 years time you can have limequat tree, but it is harder to grow and germinate seeds than kumquats or calamondin. 3/5 of seeds are dead during the germination and growing time.

If your plant is indoors, it may be a pollination issue. Use a cotton swab to spread the pollen yourself.

Grapple~ a fruit that has a combination of grape and apple but looks like an apple.

Yuzu~ variety of mandarin and papeda. Very similar to grapefruits.

Limequat~ citrus fruit of lime and kumquat.

Ortanique~ a fruit that crosses sweet orange and tangerine.