This taxon was established by Murbeck (1933) under the recombination V.rotundifolium subsp. eu-rotundifolium. According to Ferguson (1972) and Benedí (2009), this subspecies is distributed in southern Italy, Sicily, Algeria, and Tunisia. However, for Fennane and Ibn Tattou (2005), Ibn Tattou (2007), and Dobignard and Chatelain (2013), this taxon is spontaneous in Morocco. Under its current recombination, V.rotundifoliumsubsp.rotundifolium it is accepted in the Partical flora of Morocco (Fennane and Ibn Tattou 2005, Ibn Tattou, 2007), in the index of synonyms for the flora of North Africa (Dobignard & Chatelain, 2013), and by the APD (African Plant Database 2022).

(2)Pomel (1874) described on Verbascumnumidicum based on the collections of Choulette exs. [exsiccata] 369, but did not provide collection date nor the name of the herbarium where the original material were housed. After a thorough search, two specimens were found, one at Herb. MPU (MPU004892) and the other at Herb. JE (JE00013694), both of which matched the data provided in the protologue. Thus, the sheet MPU004892 is chosen here as the lectotype of the name V.numidicum, because it is better preserved and shows more diagnostic features described in the protologue.

(3) The protologue of Verbascumrotundifoliumvar.castellorum (Maire 1938) is composed of a Latin diagnosis, and the details of the collection locality on limestone rocks below Ksiba region at an altitude of about 900 m in the Middle Atlas, Morocco, but there is no mention of the name of the herbarium that houses the original material. Four herbarium sheets deposited in Herbs MPU (MPU004005, MPU004006) and P (P01167373, P00083085) were traced. These specimens can be considered as the original material according to the type details provided in the protologue. The specimen P00083085 persevered at Herb. P is better conserved and best represents the diagnostic features of the taxon given in the protologue; hence it is selected here as the lectotype for the name V.rotundifoliumvar.castellorum.