I’m pretty sure these are photos of Thevetia ovata, although not positive… please correct me via comment forum if you have doubts. This does appear to have a more wrinkled leaf then photos that come up on an image search. This could be a different species although T. ovata is what I’ve seen listed as being present in this area. My friend / colleague Stan (Plant Creations) suggests its likely a serious mite or thrip or combination infestation, which is looking like the most probable explanation.
I took these photos Thevetia ovata last week in the dry tropical forests along the coast of Jalisco, Mexico. The plant was growing just in from a beach inlet as a large shrub / small tree (up to 8m). Thevetia peruviana is a more common related species, often seen used as an ornamenal plant in the tropics and subtropics. Despite its pervasiveness the plants ethnobotanical (medicinal, magico-religious, nefarious) uses are often overlooked.