I honestly don't know - what kind of plumbago do you mean? I have Ceratostigma which is also known as Chinese plumbago, but it's definitely not that. This is quite sappy and soft.
'If you have a garden and a library, you have everything you need.'
I can see what you mean, but there isn't another one in the garden or nearby. The leaves are also flimsier than Choisya (though I guess a newly self-seeded one could be flimsy?)
'If you have a garden and a library, you have everything you need.'
Are you saying it's part of the J. beesianum? I did trace it back to the base - it emerges from within it, but the leaves are a completely different shape, size and colour and the stems are different too. Also the J. beesianum leaves are opposite and I think these are alternate.
'If you have a garden and a library, you have everything you need.'
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It is definitely not that.
Interesting..I have been thinking..green stem unusual...but getting no where. Sorry.
https://www.google.com/search?q=passiflora+caerulea+leaf&client=firefox-b-d&sxsrf=ALiCzsYAS2DBzEOM-_hJ2gZLndlLWwGsSA:1658994366079&source=lnms&tbm=isch&sa=X&ved=2ahUKEwiOnP_Oi5v5AhVOZcAKHdOkC5QQ_AUoAXoECAEQAw&biw=1280&bih=595&dpr=1.5