Thank you, Jaynine! I think that could be it. From researching, seems that was the Aztec name given to it. It actually translates as "flower of the dead"

This is called "proliferation." Some roses do it most of the time. Some never do it. Some do it when they are over-fed. It was one of the things I detested about the Austin rose, 'Fisherman's Friend.' It may not do it everywhere, but in our garden, it did it in 90% of its blooms. Here is an article that discusses it: http://www.romanticgardening.com/2011/06/what-is-rose-proliferation.html

One more. These glowing flowers greeted me in the early light of morning. They are from another columnar cactus cultivar passed along to me by Patty. In the background are the yellow flowers of Thyrallis ...

Plumeria do have the ability under managed conditions to air root like an orchid but it is not a natural habit. That looks to me like a branch which started forming but has since sealed up and been passed over for reasons unknown. Unfortunately they never amount to anything. DSP are wonderful plants and yours is very nice. its one of my favorites for its growth habits, shiny green leaves, and abundant blooms. Some say it has very little scent which may be true per flower but with the amount of blooms a mature DSP can produce all those little bits add up to a wonderful perfume scent. Great job on it. K.