Is it possible that we've actually won our skirmish against the aphids? Mind you, we've had to resort to chemical warfare. Sorry about that. We put down this ant poison trap near our mystery plant. I also sprayed the plant with a mild dilution of Bronner's Magic Soap.
POSTSCRIPT: My aunt says the plant is a Desert Rose (Adenium obesum) Everybody seems to have them in pots in Hawaii.
Today, there were two flowers blooming and no sign of ants or aphids. Granted it's only been about 4 days, but those bugs are usually back within a couple of days.
I checked all the leaves and couldn't find any of those sneaky, persistent, insect extremists.
We'd also put one of those ant poison things by our red ginger plants that were constantly attacked and over-run by ants that kept sucking the life out of the poor, innocent, young flowers.
Well, no sign of ants and the flowers are looking pretty healthy and happy now.
I know this was only one battle. We haven't won the war, but I'm willing to settle for a little peace.