Hyssop
Collier's New Encyclopedia: a genus of plants of the natural order Labiatæ, distinguished by four straight diverging stamens and a calyx with 15 ribs. The known species are few. The common hyssop (H. officinalis) is a native of the S. of Europe and the East. It is found on the Alps of Austria. It is a half shrubby plant. The flowers generally of a very beautiful blue. It has an agreeable aromatic odor. It has long been in cultivation for the sake of its leaves and young shoots, sometimes used for culinary purposes as a seasoning, but more generally in a dried state as a stomachic and carminative. A syrup made with them is a popular remedy for colds.
Aiton's Encyclopedia: his'sup, a term of uncertain application. The garden hyssop is a bushy herb of the mint family. The scriptural hyssop, "that springeth out of the wall," and that was used in sprinkling the people for their purification, may or may not have been a similar plant. It is thought by some scholars to have been the caper-bush.
Covered by Collier's New Encyclopedia and Aiton's Encyclopedia