I don't have any hope of identifying this Filipendula in Stanley Park, along the bike path outside the Greig Rhododendron Garden. I was interested in it (and recognized it!) because I have just acquired a Filipendula 'Red Umbrellas' for my balcony, just a place holder until I get what I really want for this dark but protected corner of my balcony, where I want something tall but not dense. This cultivar has great leaves. There are better photos at Filipendula ‘Red Umbrellas’ | Viridis - you can select the language on that page. It notes that this is likely a cross between F. multijuga and F. palmata.