Acmella alba (L'Hér.) R.K. Jansen Acmella alba (L'Hér.) R.K. Jansen in Syst. Bot. Monogr. 8: 62. 1985 sec. Hassler 2018≡Spilanthes alba L'Hér., Stirp. Nov. 1: 7-8, t. 4. 1785 ["1784"] syn. sec. Hassler 2015–2018