Douglas Justice's May 2017 in the Garden | UBC Botanical Garden blog features Cistus, which had better hurry themselves up if they're going to show up in May. Well, there aren't so many photos around of Cistus buds, so here we go, three of the species he mentions. See the blog for a nice blossom photo of Cistus x lenis 'Grayswood Pink'. This was the only one that had some open flowers. Cistus albidus - nice to not have any flowers getting in the way of all those white hairs for which it's named. Cistus laurifolius, with very pretty buds. I figured I may as well photograph the branches, since there weren't any open flowers. That last one is surrounded by Salix lapponum, which has a few fruits starting to develop in the left-most flower. Douglas also featured Cistus in June, 2015, a year when most of them actually did open by the end of May. You can see flower photos in this thread: May 29, 2015 - June in the Garden, featuring Cistus.
Here are a few more favourites from today. Anthyllis vulneraria, kidney vetch Camassia leitchtlinii in front of Dasiphora fruticosa 'Yellow Gem'. The third and fourth photos' tag says Potentilla fruticosa. Wikipedia says that genetic evidence shows Dasiphora to be distinct from Potentilla. Carex grayi with its wonderful fruits. The common name for this on some sites is gray sedge, and on other sites is Gray's sedge, being named for botanist Asa Gray.