Haplopappus laricifolius (Ericameria laricifolia) - Herba del Pasmo
"Its infusion is used by the native Mexicans and Spaniards for this condition. In convulsions—epileptic, hysterical and puerperal—it has been used. Its anti-spasmodic influence when used hypodermically must be studied."
(Finley Ellingwood: The American Materia Medica, Therapeutics and Pharmacognosy, 1915)