In the protologue of Celsiazaianensis, Murbeck (1923) cited an element collected by Benoist from Zaïan region, between Aït Lais and Ain-leuh, Morocco, and he indicated that type material is preserved at the Cosson Herbarium. The latter collection is housed at Herb. P according to Stafleu and Cowan (1976–1988). The protologue also includes citation of the locality “Entre Aït Lias et Aïn Leuh”, collection date “5 Juin 1918”, and name and number of collector “P. Benoist, 525”. At Herb. P, we have found only one specimen with barcode P03425567 bearing a single plant, and determined by Murbeck as “Celsia zaianensis Murb.”. This specimen is morphologically close to the original description. Furthermore, there is an indication on the label indicating a new species (“n. sp.”) and the label has the collection date and collection locality, and collector number matching the information given in the protologue. Since only a single specimen is mentioned by Murbeck (1925), one may argue that the relevant specimen is the holotype. However, Murbeck (1925) did not use the term type. Therefore, we herein designate the sheet P03425567 as lectotype.