Could be that a rootstock has taken over. How many leaflets does each leaf have, one or three?

can you google Seville sour orange, does the fruit match that description? I'm actually looking for sour orange fruit right now.

most citrus come true from seed.

Thick skins are sometimes due to inadequate water.

fertilizer, minerals, and proper water and pruning. Your tree should recover and produce nicely.

I suspect that the root stock variety has outgrown the preferred variety. Very common on neglected citrus.

I wish he would answer my questions

I'm in Hawaii . My day runs behind yours by at least 2 or 3 hrs if your PST or PDT, 6hrs for EDT.

So, it looks as if I'm going to keep the orange tree.

Keep in mind that I am a northern tier transplant to the tropics. My only experience with citrus fruit has been in the produce section.

I went back out to look the tree over again today. It is not growth from the root stock. With that said, there may be one branch that might be. But, it looks the same as the rest of the tree. I don't think it is. Time will tell.

Now, I found an orange laying on the ground. It seemed to be in OK condition. Then, I found a second that had begun to deteriorate. I then located 6 more still in the tree and picked them. Everything now left on the tree is small [3" or less dia] and very green.

I have just eaten one, the one from the ground. It peeled much better. The white was thin but didn't seem to obstruct peeling. It was juicy and semi- sweet, very different from the one I tried a while ago. I'm now thinking that it was not fully ripe even if it was orange in color. The membrane on the sections is still pretty tough, but doable. Part of the problem may be the high rainfall here, lots of cloudy days, and a clump of secropia weed trees that block the afternoon light to the tree. I am getting ready to take them out when I begin to clear some more jungle in a few weeks.

Keeping the orange tree creates a problem.

I had bought a Tahitian lime to replace it with. Now, I have to figure out a new place to put it.

It did have a problem with chlorotic leaves. That is why I had treated with dolomite. The older leaves are still chlorotic but, the newer ones are green. I'll be doing some work around the tree getting ready to make a building pad for a couple of garden sheds, bee hives, etc.

There is a lemon that was also in very poor condition. It is now showing much improvement in spite of a blow-down tree falling on it breaking several larger branches off of it. My poor citrus: orange, lemons and tangerines have taken a beating, but seem to be doing better in spite of everything.

Thanks for the advice folks.

OK yeah it may have not been ripe. Oranges color up months before they're ready to eat. Some varieties then hold well on the tree for a couple more months. Best to pic one and taste it, if it's sour or bitter hold off for a few more weeks. If it's sweet, note the date and check next year around that time. Soon you'll get to know when they'll be ripe.

Oranges don't get orange in Hawaii; they may get sorta yellow; but they will never "look" ripe. When they are full size and fall on the ground that is a sure sign they are over ripe.

These are turning nicely orange.

Although, most are still lightly green on the upper side near the stem, just a blush of green.

They do look pretty "grungy", though. But, most of it washes off making them look much better.

The skin has a look similar to the look of bananas that thripes have been eating from. That may be the source of the "grunge" on the skin.

Other than cosmetic, it doesn't seem to hurt the oranges just as it doesn't seem to hurt the bananas.

One orange has a couple of "scabby" looking spots on it.

It doesn't appear to have hurt the interior of the fruit.

The interior membranes around the sections and the pulp globs are quite
coarse making them a bit less than desirable for peeling and eating.

I made juice from a couple of the tree picked fruit.

It was very good tasting. It is now my orange juice tree.

The one I found on the ground, kept, and subsequently ate, was still good. Apparently, if you get them soon enough, being on the ground is not necessarily a bad thing.

They are large, 3" to 3-3/4" dia, seedless, and very juicy.

They are not navels.

If these oranges are any indication, mid to late June or mid July is their season.

EDIT:

I just went to the nursery's webpage. All but two of their orange trees are navels. The ones that are not navels are Moro Blood and Valencia. Valencia agrees with their appearance, and would seem to agree with their making good juice.

Would that account for the coarseness of the interior membranes?

Definitely a juice orange, they typically have thick tough membranes, plus most tend to ripen in summer. Valencia is the most common juice orange but it does have seeds.

Midnight Valencia is a seedless type though.

http://www.citrusvariety.ucr.edu/citrus/midknight.html

Shamouti is a poplular juice orange in europe, often called Jaffa

http://www.citrusvariety.ucr.edu/citrus/shamouti.html

Hamlin is another popular juice orange. Good in tropical areas.

http://www.citrusvariety.ucr.edu/citrus/hamlin.html

These are just a few guesses. This site is a good one to search more. Glad it turned out to be a tasty one.

Midknight is a good orange, I've bought the fruit from Kroger. It's much larger than a regular Valencia. Same taste though.

I have a regular Valencia though and don't regret it. For me more smaller oranges is better than less big ones. But that's my preference. I eat valencias, have no interest in juicing them.

shamouti is supposed to be nice, if it's the real one not the Joppa or flordia jaffa. But it's very unstable so in a way junk. But one tree for a backyard, we wouldn't have to worry about the instability.

These are their descriptions of their citrus trees:

http://plantithawaii.com/sample-page/citrus/

They say their Valencia is seedless.

Although, if you look closely at the photo, you'll see seeds in the sample orange.

probably another website screw up. They're common.

Their Valencia is probably the Midknight, although they don't use that name.

The fruit in the photo from your link looks like what I'm getting. The size description seems to be good also. I had a hard time accepting Valencia as the type because every Valencia I'd ever seen has been a small and seedy, produce section denizen.

Plant it Hawaii is a wholesale nursery, but, twice a year [spring and fall] they open up for a weekend selling to retail customers. I go 2X a year and grab at least 1 usually 2 or 3 trees each visit.

I've bought several different types of fruit trees from them so far, Sharwil, Lamb Hass, and Ota avos; Honey and Satsuma tangerines: Longan, Lychee and Rambutan Sapindaceae type fruit trees; a Jaboticaba, a Tahitian Lime, and a Mulberry. Only the Tahitian Lime and Mulberry are waiting for a spot to plant them in.

Then, there are a Sharwil avo, a Meyer Lemon, a Honey Tangerine, a Mystery Tangerine [My guess is that it is a Dancy], a couple of Kefir Limes, and what I think is a Eureka Lemon as well as the Valencia that came with the property when we bought. Then, there are a couple of figs that are not doing well at all. In fact they are almost dead. I'm not worrying about them. I'm just ignoring them and letting them die off.

Then, I have 2 clumps of Dwarf Brazilian [Hawai'ian Apple] bananas, 1 clump of Ice Cream bananas, and a large area where I just put in 10 Tall Brazilian [Tall Hawai'ian Apple] bananas one of which has begun to fruit already. It will, in a very few years, become 1 large clump of tall Hawai'ian Apples, our main banana source.

I have fruit trees coming out of my ears.

Wow, you sure do!

Just fyi, "seedless" is commercially defined as less than 5-6 seeds per fruit on average. So it might be the right pic depending on how many seeds are in the pic.

Sorry folks, I got side tracked by other projects in progress [clearing brush, cutting down and bucking up trees, setting up new composter, installing cabinets, cleaning up my mess in the garage and house before M'Lady gets back from her 3 week trip, etc]. I will get a pic of my Midknight Valencia tomorrow. I have a few more peripheral questions concerning this tree and its fruit. This thread is getting so long that I 'll continue with the photo and questions in a new thread after I get the photo.

Thanks for your input, people.