I have Crinum americanum Lee-Roy, brought it from my trip to Brazil, some 5 years ago now.
I only got a few small bulbs and only kept one (originally two, but lost one due to over-watering in the winter season) for myself as I have soooooo... many plants and little space.
It still hasn't bloomed but it has grown a lot, I think next season it will make its show, I keep it inside during the winter months, and put it in my pond in the growing season when it likes its feet wet, it was a natural swamp where I found them growing, also a place where snakes like to roam around, local people would mow them down once in a while for that reason, but the Crinums still bloomed!
Pteridophyllum racemosum and Eucharis amazonica look like real gems!