What is this green fruit?

Green fruit?

Pomelo? Or perhaps ugly/ugli fruit (Jamaican tangelo)?

Some kind of citrus.
John S
PDX OR

I agree with John. Maybe yuzu?

Could be. I'm not that expert at citrus.
John S
PDX OR

From the picture it looks like it has thorns? if it does it's most likely not a Pomelo or Jabong,
can you tell us what the fruit tastes like when ripe?

I don’t know when it is ripe. It was bitter when I tried it. Kind of think it is a Jamaican tangelo

I wonder if it is the rootstock where the grafted variety died?  They almost always grow back thorny and the fruit is bitter and nasty.  The rootstock handles cold much better than the fruit variety grafted to it.  It is very common in areas where citrus is grown and occasional freezes occur.  The parent plant dies, but the rootstock doesn't.  It will then grow into its true parentage and the result is some very bitter tasting citrus!

Kaffir lime?

Nikki Corey wrote:Kaffir lime?

That was my guess.

Depending on where you are and if the tree experienced any trauma (like a freeze), the tree (or part of the tree) may have reverted back to the rootstock.  

The shape of the fruit and rough texture makes it look like a rough lemon which is used for rootstock in the United States.  However, rough lemons are yellow from what I've seen.  There IS a tinge of yellow in one of the photos, so this may just me an unripe rough lemon.

The other possibility is that you have something grown from seed so it could be a hybrid of something else.  I grow my lemon and lime seeds out to use the leaves in cooking and tea, not necessarily for the fruit (of which I haven't had any yet).  One lemon tree has thorns on it almost 2" long.  Crazy stuff.

All the times I've had mystery citrus like that, I've waited to see what the fruit does (and the tree) to see what qualities they have that would be useful to me.  In the past I've had very sour oranges that made the most wonderful lemonade type drink.  I've also used the zest in cooking, and like I mentioned above, the leaves.

Have fun!

Looks like an Ugli fruit to me too. I grew a few from seed and they definately have thorns!

Dawna Janda wrote:Depending on where you are and if the tree experienced any trauma (like a freeze), the tree (or part of the tree) may have reverted back to the rootstock.  

The shape of the fruit and rough texture makes it look like a rough lemon which is used for rootstock in the United States.  However, rough lemons are yellow from what I've seen.  There IS a tinge of yellow in one of the photos, so this may just me an unripe rough lemon.

The other possibility is that you have something grown from seed so it could be a hybrid of something else.  I grow my lemon and lime seeds out to use the leaves in cooking and tea, not necessarily for the fruit (of which I haven't had any yet).  One lemon tree has thorns on it almost 2" long.  Crazy stuff.

All the times I've had mystery citrus like that, I've waited to see what the fruit does (and the tree) to see what qualities they have that would be useful to me.  In the past I've had very sour oranges that made the most wonderful lemonade type drink.  I've also used the zest in cooking, and like I mentioned above, the leaves.

Have fun!

Is it possibly Flying Dragon?  If so, the juice from the fruit gets crazy sticky on the knife. Not the typical sweet and juicy citrus.

:kaffir-lime-tree?

Leanne Phillips wrote::kaffir-lime-tree?

Based on pictures I'm seeing on the net, the shape of the fruit and leaves, and those thorns, all suggest it's kaffir lime.

Many great uses for the fruit and the leaves.