Hello, everyone!
Last week, I received several neglected houseplants that I am trying to tend to. I have been able to identify all but one of them. The mystery plant is around 8.5 inches tall. Its most unique feature is the vein along the middle of the leaf that curls up at the end. What could it be?

A variety of croton (codiaeum variegatum) I believes.

I'd overlooked crotons as a possibility because I'd only seen the Petra variety (the vein on the leaf was wrong.) After your suggestion and some digging, I think it's either a Mammy or Bush on Fire Croton! The color must have faded from being in low light. Thank you!