Polygonum sp

Now that we can see the actual plant, I agree with Euphorbia cotinifolia. The flowers on the euphorb are completely different from that of the smokebush but otherwise they do look similar. so easy to mistake if you are just looking at photos. In fact, the species name of the euphorbia means having leaves that look like cotinus so confusion is rife if not seeing the actual plant :-)

Google lens showed a similar plant like this for sale as purple passionfruit, with no species name attached. I would never buy any plant sold without the exact species name. I'm assuming that you saw it for sale too, and that's why you're asking. It seems to resemble young Passiflora seedlings that start out with regular shaped leaves before making lobed leaves. I'd steer away from buying items from such places. If you want a better ID, show it again with mature foliage. But then,it's not yours, is it?

The dark "dead" aphid is called an aphid mummy.....it's been parasitised by a special wasp that laid its eggs into the aphid's body. The tiny wasp larvae will feed slowly but surely on the aphid's internal organs until they emerge as mature (though tiny) parasitic wasps, leaving an empty aphid mummy.