Verbascum thapsus Identity & Plant Part
The botanical entity is Verbascum thapsus L., great mullein, a biennial of the Scrophulariaceae that forms a rosette of large, felted gray-green leaves in its first year and a tall yellow flower spike in its second. The part used is the leaf. The flowers and the root are not part of this mullein leaf extract.
Two points matter to buyers. Several Verbascum species are collected as mullein, and flowers are traded separately from leaves, so a specification should quote the Latin name and the leaf. The leaf holds mucilage, iridoid glycosides, phenylethanoid glycosides such as verbascoside and flavonoids, which are named here only as families.












