Robuta

https://pfaf.org/user/Plant.aspx?LatinName=Lysimachia+barystachys
Lysimachia barystachys is a PERENNIAL growing to 0.6 m (2ft). See above for USDA hardiness. It is hardy to UK zone 5. It is in flower from May to August. The...
lysimachia barystachysyellow loosestrifeplant databasemanchurianpfaf
https://species.wikimedia.org/wiki/Lysimachia_barystachys
lysimachia barystachyswikispecies