What is "thapsus"

Usage examples of "thapsus".

Helenium (Elecampane), the leaves of which resemble Foxglove leaves, though they are less pointed, and the lower lateral veins do not form a 'wing' as in the Foxglove, the leaves of Symphytum officinale (Comfrey), which, however, may be recognized by the isolated stiff hairs they bear, and Verbascum Thapsus (Great Mullein), the leaves of which, unlike those of the Foxglove, have woolly upper and under surfaces, and the hairs of which, examined under a lens, are seen to be branched.