HYSSOPUS, hyssop; a genus of the gymno-
spermia order, belonging to the didynamia class of plants. There are three species; but only one of them, viz. the officinalis, or common hyssop, is cultivated for use. This hath under-shrubby, low, bushy stalks, growing a foot and a half high; small, spear-shaped, close-fitting, opposite leaves, with several smaller ones rising from the same joint; and all the stalks and branches terminated by erect whorled spikes of flowers, of different colours in the varieties. They are very hardy plants; and may be propagated either by slips or cuttings, or by seeds. The leaves have an aromatic smell, and a warm pungent taste. Besides the general virtues of aromatics, they are particularly recommended in humoral affections, coughs, and other disorders of the breast and lungs; and are said notably to promote expectoration.