Nasturtium niloticum Boiss., Diagn. Pl. Orient. 8: 19. 1849. Type: “Hab. in humo limoso ad margines praeruptos Nili in Aegypto superiori (Boiss.!), in Nubiâ propè Chartum Kotschy pl. exs. Nº 324 sub N. palustri ”. Lectotypus (first step designated by JONSELL, 1982: 56; second step designated here): SUDAN: “Ad ripas nili caerulei prope Chartum ”, 4.III.1840, Kotschy 324 (G [G00446042]; isolecto-: BM, BR [BR0000008886910], G [G00446043, G00446044], HAL [HAL0026657], HBG [HBG506141], HOH [HOH009372], JE [JE00003848], P [P04719362], REG [REG000606], STU [STU000335], TUB [TUB000547, TUB000548, TUB000552], UPS, W [W18890321737, W0036024]). Syntypus: EGYPT: “Superior ad ripas praeruptus Nili”, I–III.1846. Boissier s.n. (G [G00446045, G00446046], G-BOIS [G00332090]). = Rorippa micrantha (Roth) Jonsell in Svensk Bot. Tidskr. 68: 384. 1974. Notes. – The area of the designated lectotype falls outside the Flora Orientalis region, and that is why the specimen is housed in G rather than G-BOIS. Kotschy 324, instead of Boissier s.n., is designated as lectotype because it has fully mature fruit with well-developed (vs undeveloped) seeds, both of which structures are essential in the determination of Rorippa (and Nasturtium) species. There are three duplicates of the lectotype gathering in the Geneva herbaria, and JONSELL (1982) did not indicate which one is the “type” nor did he annotate any of them. For this reason, a second step designation is done here.

Published as part of AL-Shehbaz, Ihsan A. & Barriera, Gabrielle, 2019, Typification of Edmond Boissier's Cruciferae (Brassicaceae) names enumerated in Flora Orientalis, pp. 1-193 in Boissiera 72 on page 30, DOI: 10.5281/zenodo.7630433