Lysimachia - compare with L. punctata. Yes, it is not native. But (L. punctata anyway) is too infrequent wild in this area to be considered much of a weed.
Thank you. Is it invasive at all? I have a hillside that needs to be terraced but until then is a mix of grass, misc weeds and exposed sand so is there any detriment to letting it stay for now?
In my limited experience, I would say you could let it stay for now. As I recall, it did not self-seed too much in my previous garden on the lower mainland of BC (compared to foxgloves for example) and was easy enough to pull out.
I can't see any sign of glandular hairs on the petal margins, so it may be Lysimachia vulgaris (Yellow Loosestrife), rather than Lysimachia punctata (Dotted Loosestrife). But the pics aren't detailed enough to be certain.
Do you need a better photo of the flowers? L. Vulgaris is listed as invasive in wetland areas in WA. My hillside is about as far from a wetland as one could get. Borders on steep slope and sandy extreme drained soil.
Yep, a sharply focussed close-up of a fresh flower please - or if you can look yourself with a magnifying glass and see it the petal edges are smooth (Yellow Loosestrife) or fringed with small glandular hairs (Dotted Loosestrife).
