A Plant species of the Family Viscaceae, order Santalales, subclass Rosidae. This is the traditional Mistletoe of Literature and Christmas. Members contain viscotoxin (5 kDa basic polypeptides related to Thionins), beta-galactoside- and N-Acetyl-D-Galactosamine-specific lectin II (60 kDa), and polysaccharides. Mistletoe lectin I is a type 2 Ribosome-inactivating protein. Commercial extracts include Plenosol, Eurixor, Helixor Isorel, Iscador, and NSC 635089 (Antineoplastic Agents, Phytogenic).