Rosemary of commerce comprises dried leaves of evergreen shrub of Rosmarinus Officinalis. This is a dense, evergreen, hardy, perennial, aromatic herb, 90 cm high with small (2-4 cm) pointed, sticky, hairy leaves. The upper surface of the leaf is dark green whereas it is white on the lower side. The leaves are resinous. Branches are rigid with fissured bark and stem is square, woody and brown. Pale blue small flowers appear in cymose inflorescence. It can be grown either as a field crop or as an indoor plant.