The white flowers are definitely coming from the larger leafed plant? If so, that is also a jasmine. If the original jasmine planting was the dwarf 'Minima' version, perhaps what you are seeing is a reversion.

That's interesting. The white flowers are *definitely* not coming from the smaller-leaved plants, which take up most of the bed. Only from the larger, darker leaves. The fact that the leaf shape is the same, and also the stem layout (doubled-opposites) led me to suspect that it was some other variety of jasmine. In fact, those look like jasmine flowers (but the original ground cover shows no inclination to bloom)! Is reversion common in this plant?

I am not aware that reversion is common but it is always possible with any cultivar to revert back to the species. And 'Minima' is know to be a very shy or reluctant bloomer, which would tend to confirm the notion of reversion.

If you poke around in there you can see if the two versions are connected to one another.

Many plants put out a larger version of themselves as they age. Usually heavy pruning will keep this tendency in check.

It doesn't appear to be possible to trace the stuff back. The vines are too long and tangled. But one interesting fact is that I have about 800 square feet of this oriental jasmine, and the unidentified stuff is just popping up in one 40 square foot corner. It's possible that the unidentified stuff is ONE PLANT that is spreading, rather than changes that are happening everywhere.

My apologies. More properly, I should be calling the bed "asiatic jasmine".

Even more properly it isn't a Jasmine at all, but a Trachelospermum ;-) either T jasminoides or T asiaticum.

I haven't a clue how to tell the one from the other. I have T asiaticum. It rarely produces a flower. Maybe I have Minima?

The common name for Trachelospermum asiaticum is asiatic jasmine.

I know.

I was referencing the expression 'properly called'. Seems the ironic ;-) was wasted.

It looks like a piece of confederate jasmine that got mixed in with the minima asiatic jasmine. Is it fragrant by any chance?

All Trachelospermum are fragrant so that isn't a distinguishing feature.

The taller plant is definitely Trachelospermum jasminoides, but - judging from the picture alone without prior knowledge - the lower one could also be Vinca minor. If the knowledge about the common name of the original planting is accurate and no purple flowers have been observed at other times, the lower plant is some non-variegated T. asiaticum (many cultivars exist).

I think there is some vinca minor in there, but I don't see any blue flowers or even buds right now in the smaller-leaved stuff.

Not seeing any Vinca minor in the pictures but there might be some in the area we can't see. However, you probably would have seen some blue flowers by now if it were there.

^^ I agree....this is major bloom season for vinca here and since it loves shade, if there were much vinca included in that planting, you should see some very obvious signs of it :-)

None of the leaves in the shot are those of vinca. The common name I am used to for Trachelospermum jasminioides is star jasmine. Lots of people located near the Sound in my area have it growing these days, including a local hospital that used it to cover extensive areas of wall surface ("used" because last time I drove by one of the plantings - on the main building itself - had been removed).

Whereas I don't see T. asiaticum much here, outside of independent garden centers.

I have T asiaticum. It rarely produces a flower.

A late friend, a former King County Cooperative Extension Agent tried it in his garden and also found it to be shy flowering.

Sorry, by "in there", I meant "in the very large bed". I'm sure there is no vinca in the picture I posted of a very tiny piece of the bed.

And yes, I rarely see flowers in my large bed of asiatic jasmine.

Also, as many have said, asiatic jasmine is NOT jasmine. So let me rephrase what I said before. The unidentified plant resembles Trachelospermum asiaticum, but does not necessarily resemble jasmine.