Re Linaria's comment: I've also been very wary of Lysimachia punctata, but occasionally used it. I planted it in a perennial garden (full sun, upgraded clay soil)) (installed in 2000) and have maintained that garden to date. I did get worried about it spreading, so put it in a pot in the soil, but found that it would not stay in. On the other hand, I've subsequently simply reduced it (pulling up/spading out runners), yearly after flowering, and had no problem maintaining it more or less in the same location. As per Morz: a variegated form ('Alexander') was present in another garden (semi-shade, upgraded clay soil) I maintained over about five years. It spread very minimally. I don't know how much of that was related to a contrast between variegated and non-variegated forms of the same plant (viz. more versus less vigorous) and how much was to do with it's semi-shade location. I wouldn't use any L. punctata in our own mixed perennial beds, because too many plants are maintained too close together.

Watch out for those common names. Ox eye daisy is most commonly applied to an entirely different plant - Leucanthemum vulgare. Telekia is sometimes known as Giant or Yellow ox eye daisy. However, Telekia isn't too hard to remember and if you are thinking of ordering a plant you need to know you will get the right one.

Iris pallida 'Aureo Variegata'. They should bloom with a pale purple, sweetly smelling flower like a smaller bearded iris. If not blooming for you, they should probably be divided - that looks like a pretty thick, dense clump.

Try Oenothera biennis (Common evening primrose) to see if that fits. Have a look on gardenia net for more information. I like the height of this plant. Online says it attracts birds bees and butterflies. It is also fertilized by night flying moths which are attracted by its lemon fragrance and by bees in the morning before closure. I will be looking into this plant. Thanks for posting!