Hyssop (Hyssopus) is a genus of about 10-12 species of herbaceous or semi-woody plants in the family Lamiaceae, native from the east Mediterranean to central Asia. They are aromatic, with erect branched stems up to 60 cm long covered with fine hairs at the tips. The leaves are narrow oblong, 2-5 cm long. The small blue flowers are borne on the upper part of the branches during summer. By far the best-known species is the Herb Hyssop (H. officinalis), widely cultivated outside its native area in the Mediterranean. Hyssop is used as an ingredient in eau de Cologne and the liqueur Chartreuse. It is also used to color the liquor Absinthe, along with Melissa and Roman wormwood. Hyssop is also used, usually in combination with other herbs such as liquorice, in herbal remedies, especially for lung conditions. It is a convulsant due to its Effect on CNS.