thank you for your reply it is an endangered plant here then. It is strange, we didn't see it until today.
Trilliums in Ohio: http://www.dispatch.com/content/sto...-trilliums-part-of-magical-day-in-forest.html
Saw T. recurvatum in flower at Florabundance sale in Seattle yesterday - looked like plant shown here. Right next to it on the table was T. erectum in flower - one of those funny happenings, that I would encounter these two together, soon after this discussion.