Must Be A Reverse Sport

[Millet]

Again this year the same branch on my Cara Cara tree is producing Washington Navel Oranges.  Last year I noticed that branch was not producing pink fleshed Cara Cara, but rather the regular orange colored fruit.  This year since the same branch is once again producing fruit with  orange colored flesh that branch must have surely revered back to a Washington navel.   For those that don't know, Cara Cara were originally a sport of a Washington Navel orange tree growing in Venezuela.

[Citradia]

What a strange phenomenon.

[citrange]

Cara cara is thought to be a chimera and is known to produce branches which revert back to the Washington navel.
On the CVC website there is a note about distributing Cara Cara budwood which acknowledges this possibility:
.... this is a chimera and could revert to non-pink fruit through inadvertent selection of mutant bud. We probably should not release from any trees which have not fruited.
See http://www.citrusvariety.ucr.edu/citrus/caracara.html