The seeds are all over the long branches. I first noticed them two years ago. The finches love to eat them and so do the cardinals and a few other unidentified birds.
I gathered a bunch of them and planted them in pots and they germinated readily.
I don't know if it is a species or a cultivar so don't know if they will come true from seed.
I use the cuttings to plant here and there in my large yard that is otherwise pretty sparse in the area that they are in.
I have a humongous one in the front yard that covers a large area and provides a haven away from the scorching sun for my cats and dogs.
I noticed you said you did not see any seeds on yours.
I went out and pinched a piece off of my bush. It is setting seeds now. The pointy things near the woody branch. They will dry to a brownish color and then split open. This is when the birds will enjoy them. There are tan seeds inside that are about four to five to a pod.