A few years ago I planted a variety of seeds from citrus fruits of orange, lemon, lime, grapefruit and mandarine. Only a few of them grew into big plants, and now I have 2-4 large plants, but I don't know which of them are which. Can I tell from the shapes of the leaves which citrus plant it is?
Here's a group photo with some unidentified bonus plant in the middle:
The two on the left are growing from the same spot, so they could be from the same seed. And the unknown guest plant in front is growing from the same pot. The more bushy guy on the right has its pot all to himself. After some image searching and seeing similar leaves on posts about citrus plants, I figured that the mystery plant could also be a citrus, but I'm not sure.