[Nephythys]

Can you help me identify a flower?
The flowers is white, appears waxy and shiny. The “petal” is one piece, looks like a canoe or a leaf (best way I can describe it). Inside the white petal is the stamen, which looks like a knobby stick.
The leaves are dark green and waxy shiny as well. The plants all have 1 to 2 blooms on them.
I suspect they are a type of lily but can not find anything about them. My office was giving them away but I want to find out what they are and if they are poisonous to house pets before I bring them home.
Thanks!