DERIVATION.--The dried ripe seeds of Sinapis alba Linne.
HABITAT.--Southern Europe and Asia; cultivated in temperate climates.
DESCRIPTION.--Globular, with a circular hilum; shell yellowish, finely
pitted, hard; embryo oily, with a curved radicle and two cotyledons, one
folded over the other; free from starch; inodorous; taste pungent and
acrid.
DOSE.--Horses, 2 to 4 dr.; cattle, ¹⁄₂ to 1 oz.; sheep and pigs, 1 to 2
dr.; dogs, 10 to 15 gr.