chalcone, and other compounds. Taxonomy , the following species were accepted: Humulus americanus Nutt. Humulus cordifolius Miq. Humulus lupulus L. Humulus neomexicanus (A.Nelson & Cockerell) Rydb. Humulus pubescens (E.Small) Tembrock Humulus scandens (Lour.) Merr. (syn. Humulus japonicus Siebold & Zucc.)Humulus yunnanensis Hu For brewers' hops, which are specific cultivars, and propagated by asexual reproduction, see the article, "List of hop varieties". Uses Hops are boiled with the wort in brewing beer and sometimes added post-ferment; they impart a bitterness, flavor, as well as aroma to the finished product. In pharmacy lupulus is the designation of hop. The dried catkins, commonly referred to as hop cones, of the female plant of H. lupulus'' are used to prepare infusion of hop, tincture of hop, and extract of hop. Some of the compounds hops contain are under preliminary research for their potential health properties. References External links Jeanine S. DeNoma: Humulus Genetic Resources (USDA ARS National Clonal Germplasm Repository) Hops varieties research Plants for a Future: Humulus lupulus Medicinal plants Stem vegetables Dioecious plants Rosales genera Taxa named by Carl Linnaeus