They would be those white things, on the flat bract thing. It looks like we missed a lot of them, but I think only a few open at a time.
I'm attaching some additional photos of this plant. I don't like my previous idea for an ID, though I do still think it's some Marantaceae. In fact, I think I found exactly the plant, called "Undetermined Marantaceae species" from Hawaii Tropical Botanical Garden: http://www.htbg.com/Marantaceae/UNKMAR-010-11-26-002/ (scroll down to the bottom, sequenced under "U" for "Undetermined"). It probably did come into the conservatory with some name, though.