My sister in California (out of the citrus zone in the mountains) had a calamondin that was killed back to the graft last winter. The rootstock has grown into this small plant. The flowers remind me of grapefruit, but the leaves are not right for grapefruit. Any ideas?

Since most rootstocks are grown from seed, it surprises me that there are so many blossoms and small fruit on the tree. That makes me think that the calamondin scion was possibly not lost completely or that the rootstock was grown from a cutting or that the calamondin was grown from a cutting and there is no rootstock at all.

It's not grapefruit, sour orange, sweet orange, or citrange. It almost looks like a lemon although whatever it is must be more cold tolerant than the calamondin. The fruit doesn't look right for a mandarin. Possibly a Meyer lemon although it looks a little thorny for that? I think I see a little pink on the buds bud they're too burned out in the picture to tell for sure.

Do you know where the tree came from originally?

She bought it somewhere around Placerville I think. I'll find out. But the flower buds do not have the typical purple tinge that lemons usually have. More info when I talk to her tonight. The flower buds seem way to large to be calamondin.

Probably Cuban Shaddock. They look like pummelo X citron. Leaves are large and mildly lemon scented. It is commonly used as rootstock.

I would say it is Indian sweet lime.

Afterwards, I thought it could be C. macrophylla, but the petiole doesn't seem wide enough. Sweet lime has unusually scented leaves that look similar, but possibly more toothed and lime like ?

She bought it somewhere near Placerville or Camino, California, up in the mountains. I don't remember any lemon scent to the leaves.

> I thought it could be C. macrophylla
It is not C. macrophylla. Anyway it would have frozen before the calamondin.

> "frozen to the graft"
Is it cold enough there at your Sister's place to freeze a Calamondin ?
Maybe some level of stock/scion overgrowth or incompatability weakened it first ?