DERIVATION.--The dried ripe seeds of Sinapis Nigra Linne.
HABITAT.--Same as White Mustard.
DESCRIPTION.--Globular, with a circular hilum; shell blackish-brown, or
grayish-brown, finely pitted, hard; embryo oily, with curved radicle and
two cotyledons, one folded over the other; free from starch; inodorous
when dry, but when triturated with water, of a pungent, penetrating,
irritating odor; taste pungent and acrid.
CONSTITUENTS.--In the presence of water the latter converts the former
into the acrid, volatile, official oil of mustard.
DOSE.--Same as white mustard. Commercial form of mustard is a mixture of
black and white mustard, and constitutes Sinapis.