Purchased this one a couple of years back as Sunlight Sister. Which is described as "Large lemony; that turns bright gold in summer"....not too lemony....any ideas. This was from an avid collector's garden and I would guess 1980's or 90's for original purchase date. It is close to 5' wide and growing in some late afternoon sun. Biggest leaf is 10x13 with 14 vein pairs. Closest I have in my garden would be Montana - but that is not ready to bloom, so I'm ruling that out.
Looks like purple/lavender is likely bloom color.
Thanks in advance.