PlantsFlowering PlantsViolets — Family Violaceae
Leaves simple. Flowers irregular.
No image available.
Nodding Green-violet —  Hybanthus verticillatus [1,2]
Leaves opposite, maybe alt above. Lowest petal yellowish to greenish white. Flowering Apr-Jun.
Missouri Violet
Violet — Genus Viola
Evidence that species is found in Texas:
  1. USDA Plants Database, advanced search for Texas plants from the United States Department of Agriculture.
  2. Atlas of the Vascular Plants of Texas, Volume 1, B.L. Turner, Holly Nichols, Geoffrey Denny and Oded Doron, Botanical Research Institute of Texas (BRIT), Fort Worth, Texas, 2003.