Trees and Shrubs forum: Is this a Citron tree? Can someone help identify this fruit?

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California, San Joaquin valley (Zone 9b)
Jan 21, 2017 5:33 PM CST
We discovered a tree among our yard when we first moved into our place about a couple years ago. We have no idea what kind of fruit this tree has. It smells like an orange and is round like one, but tastes nothing like an orange. It is really bitter and yellow. I know it's not a grapefruit tree because I've grown up around grapefruits trees and these don't have the ruby insides like a grapefruit which has me thinking it may be a citron tree. The tree bares fruit all year around. Could you help me identify this tree? Thanks.

Thumb of 2017-01-21/RenaeC/08d8ee

Name: Sherry Austin
Santa Cruz, CA (Zone 9a)
Region: California Irises Keeper of Poultry Roses Dragonflies Birds
Bulbs Foliage Fan Photo Contest Winner: 2015
Feb 1, 2017 11:22 AM CST
Is it thorny? I was thinking it may be Bitter Orange, Citrus x aurantium, which is used as a rootstock... but the color is wrong. Often the grafted variety dies due to cold or neglect, and the rootstock takes over. There are several different rootstocks used in the industry. At least one using a grapefruit/poncirus cross. I'm guessing it's some type of rootstock you've got.
BTW, Not all grapefruits are pink inside. Ruby grapefruits were a mutation found in the 20's.. before then, grapefruits had all been pale inside.
When counting, try not to mix chickens with blessings.
Name: Porkpal
Richmond, TX
Charter ATP Member I was one of the first 300 contributors to the plant database! Keeper of Poultry Farmer Roses Raises cows
Garden Ideas: Level 2 Celebrating Gardening: 2015 Plant Identifier
Feb 1, 2017 12:20 PM CST
How big are the fruit? Could it be a Ponderosa Lemon?
California, San Joaquin valley (Zone 9b)
Feb 1, 2017 1:55 PM CST
No thorns and yes i am aware of the different variety colored insides. Thank you for the reply, but we solved it i think a week ago in the Plant Id forum. It's a pomelo tree. Thank you again for replying! :)

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