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Key to Stachytarpheta
Verbenaceae
Stachytarpheta
https://fsus.ncbg.unc.edu/main.php?pg=show-key.php&keyid=40915
1 Upper leaf surface distinctly rugose or bulging up between veins (bullate); plants typically growing upright; leaf margins crenate-serrate; flowers typically lighter colored (pale blue or pale violet to white); floral bracts lanceolate-subulate, with ciliate margins mostly below the middle; [disturbed areas]
1 Upper leaf surface not distinctly rugose or bullate; plants typically growing less upright (decumbent or nearly so); leaf margins coarsely serrate (occasionally crenate-serrate); flowers typically darker colored (darker violet, but sometimes pale blue or purple); floral bracts ovate-lanceolate, with ciliate margins mostly above the middle; [natural habitats and disturbed areas]