In tribe Verbasceae

Verbascum letourneuxii, V. sinaiticum and V. sinuatum occupy primitive status due to the less advanced characters viz. five distinct sepals, sepal median, staminal and dorsal carpellary bundles from the central stele, five petals, dithecous anthers, five staminal traces originated from the central stele to five fertile stamens and numerous lateral carpellary bundles. Absence of nectariferous disc raises Verbascum letourneuxii over V. sinaiticum and V. sinuatum .