Photo Credit: Tom Patterson
- herbaceous perennial with hairy trailing stems
- all parts with milky sap
- leaves opposite, ovate in outline, hairy on both surfaces, sometimes with conspicuous venation
- flowers greenish, 1/4- 1/2 inch in diameter, on short stalks on upturned tips of stems
- endemic to South Texas, mostly restricted to open areas on the South Texas sand sheet
- on deep sand or shallow sandy loam