AMBROSINIA, in botany; a genus of the polyandria order belonging to the gynandria class of plants; the characters of which are: The calyx is a single-leaved spathe, divided by a partition into two cells: There is no corolla: The stamina consist of a single filament in the interior cell; the antheræ are numerous,
Ambrosius numerous, with two roundish concave nectaries at their base: The pistillum is in the interior cell; the germen roundish; the stylus cylindrical, and shorter than the spathe; the stigma obtuse: The pericarpium (a capsule?) roundish and unilocular. There is but one species, a native of Turkey.