Acmella repens

Family: Asteraceae
Common Names: Oppositeleaf Spotflower, Opposite-Leaf Spotflower

Synonyms: Acmella oppositifolia var. repens
Spilanthes americana
Spilanthes americana var. repens

Native to USA: AL, AR, FL, GA, LA, MO, MS, NC, OK, SC, TN, TX 

Texas Native

Additional Resources:
Flora of North America