Cyperus potiguar Ribeiro et al. (2015: 154) .

Type:— BRAZIL. Rio Grande do Norte: Jucurutu, Serra Jo„o do Vale, 06º00’43”S, 37º08’52”W, 29 May 2010, A. R. O. Ribeiro et al. 247 (holotype UB- 207815!, isotypes HUEFS-209004!, MOSS-13636!, RB-605130!).

Cyperus planifolius var. pickelii R.Gross ex Ķk. (1936: 447). Type:— BRAZIL. Pernambuco, [Gravatá], Russinha, on wet place, 12 February 1935, B. Pickel 3779 (lectotype IPA-3311! designated here, isolectotype US-3202923!). Syn. nov. Figs. 1 C-D.

Additional specimens examined: BRAZIL. Ceará: Maranguape, Açude S „o Bento, 5 August 1935, F. E. Drouet 2187 (US-3202924!) ; Paraíba: Campina Grande, on wet place, 24 June 1935, B. Pickel 3995 (IPA-3313!) ; Pernambuco: [Gravatá], Russinha, 26 March 1934, B. Pickel 3591 (IPA-3310!, IPA-6227 not seen), [Gravatá], Russinha, in the caatinga, between bromelias, 1 May 1935, B. Pickel 3913 (IPA-6238 not seen, US-3202921!, US-32022922!)