Here’s an opportunity. Ruellia amoena sure looks a lot like Ruellia foetida, but has pigmented instead of white flowers. One often finds these two species sympatrically, or nearly so. A “must study” taxon pair evolutionarily.
Wild collected, Mexico, Tripp w/ Kiel, & Hasenstab-Lehman #1225 (RSA-POM); Photo by Erin Tripp
The Tripp Report 