one of my books says it has "good drought, salt, and wind tolerance"

It's a euphorbia, I've always found those hard to kill.

That euphorbia does very well in hot and dry conditions.

Thank you. I appreciate your help. Alicia Acconcio, Hawaii

I live on Kauai and a lot of people (locals, especially) have this plant in their yards, often in pots.
I think it's very draught tolerant and will grow an any side of the island.
I'm sure you will have luck with it on Molokai.
It grows from cuttings, btw, so ask a neighbor who has some about it.