Anthoxanthum odoratum.

Botanical name: 

ANTHOXANTHUM ODORATUM, L. Sweetgrass. Makes fragrant hay; cows fed on it give a very fine milk: sheep feeding on it produce excellent mutton.

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