Position in a system
| system | Vitae - living organisms |
| domain | Eukaryota Whittaker & Margulis, 1978 - lifeforms with nucletic cells |
| superregnum | Bikonta - bikonts |
| Corticata | |
| Archaeplastida | |
| kingdom | Plantae Haeckel - plants |
| divisio | Magnoliophyta Cronquist, Takht. & W.Zimm. - flowering plants |
| class | Rosopsida Batsch - eudicots |
| order | Lamiales Bromhead |
| family | Acanthaceae Juss. |
| subfamily | Acanthoideae Link |
| genus | Ruellia Plum. ex L. - wild petunia |
| species | Ruellia davisiorum Tharp & F.A. Barkley - Rio Grande Wild Petunia |