The Hedge Hyssop (Gratiola officinalis) belongs to the natural order Scrophulariaceoe, and is a native of marshy lands in the south of Europe, whence it was introduced into Britain nearly 300 years ago. Like Hyssopus officinalis, it has smooth opposite entire leaves, but the stems are cylindrical, the leaves twice the size, and the flowers solitary in the axils of the leaves and having a yellowish-red veined tube and bluish-white limb,' while the capsules are oval and many-seeded. The herb has a bitter, nauseous taste, but is almost odourless. In small quantities it acts as a purgative, diuretic, and emetic when taken internally. It was formerly official in the Edinburgh Pharmacopoeia, being esteemed as a remedy for dropsical and scrofulous affections. It has also been given in the form of wine for hypochondriasis. It is said to have formed the basis of a celebrated nostrum for gout, called Hau médicinale, and in former times was called Gratia Dei, on account of its medicinal properties. When growing in abundance, as it does in some damp pastures in Switzerland, it becomes dangerous to cattle. G. peruviana is known to possess similar properties.

The hyssop (’ esoδ) of Scripture (Ex. xii. 22; Lev. xiv. 4, 6; Numb. xix. 6, 18; 1 Kings v. 13 (iv. 33); Ps. li. 9 (7); John xix. 29), a wall-growing plant adapted for sprinkling purposes, has long been the subject of learned disputation, the only point on which all have agreed being that it is not to be identified with the Hyssopus officinalis, which is not a native of Palestine. No less than eighteen plants have been supposed by various authors to answer the conditions, and Celsius has devoted more than forty pages to the discussion of their several claims. By Tristram {Oxford Bible for Teachers, 1880) and others the caper plant {Capparis spinosa) is supposed to be meant; but, apart from other difficulties, this identification is open to the objection that the caper seems to be, at least in one passage (Eccl. xii. 5), otherwise designated {'abiy-y6nah). Thenius (on 1 Kings v. 13) suggests Orthotrichum saxatile. The most probable opinion would seem to be that found in Maimonides and many later writers, according to which the Hebrew ’ ezob is to be identified with the Arabic sdatar, now understood to be Satureja Thymus, a plant of very frequent occurrence in Syria and Palestine, with which Thymus Serpyllum, or Wild Thyme, and Satureja Thymbra are closely allied. Its smell, taste, and medicinal properties are similar to those of H. officinalis. In Morocco the saatar of the Arabs is Origanum compactum, Ben th.; and it appears probable, as suggested by Mr W. Carruthers, that several plants of the genera Thymus, Origanum, and others nearly allied in form and habit, and found in similar localities, were used under the name of hyssop.

See Gerard, Herball, p. 578-582; Stille and Maisch, National Dispensatory, p. 7512; Carruthers, in Bible Educator, vol. iv. p. 226-27; Thomson, The Land and the Book, p. 112; J. Smith, Bible Plants, p. 214; Furrer, art. “Ysop,” in Schenkels Bibel-Lexicon, vol. v.