Aplocera maritima.

Botanical name: 

APLOCERA MARITIMA, Raf. (Monocera, E.) Toothache Grass of Carolina. Root bitter, sialagogue, used for the tooth-ache: the grass eaten by cows affect their milk, giving it a bad taste.

Medical Flora, or Manual of the Medical Botany of the United States of North America, Vol. 2, 1830, was written by C. S. Rafinesque.