Xyris filifolia L.A.Nilsson, Kongl. Svenska Vetenskap.-Akad. Handl. 24(14): 43-44. 1892.

Wanderley, Maria das Gracas Lapa, 2017, Typification of binomials in Xyris section Nematopus (Xyridaceae) published by L. A. Nilsson, PhytoKeys 80, pp. 65-76 : 67

2. Xyris filifolia L.A.Nilsson, Kongl. Svenska Vetenskap.-Akad. Handl. 24(14): 43-44. 1892.

Type.

“Brasilien”, Caldas, Regnell III 2051, "in palude inter gramineas altas" (lectotype, designated by Smith & Downs, 1968: S! [S-R-6569]; isolectotypes: UPS!, US! [ US 00088150]) .

In the protologue of the species, two collections were cited: Regnell III 2051 and Lindberg s.n. The choice of lectotype was previously made by Smith and Downs (1968), who indicated the sheet Regnell III 2051, 30[?]- II-1880 as the “type”, deposited in S (S-R-6569), which by this indication became the lectotype. It is likely that during the distribution of the duplicates between the S (30-II-1880) and UPS (20-II-1880) herbaria, a change in the date was made in the transcription of the label. A second sheet is deposited in UPS ( Regnell III 2051), although under a different date (13-II-1880), but there is no doubt that this material is part of the same collection ( Regnell III 2051). This sheet from UPS ( Regnell III 2051, 13-II-1880) contains a short description of the species (in handwriting similar to that of Nilsson) and the observation "in palude inter gramineas altas", which occurs in the protologue. The Lindberg collection 556 (XII-1854), deposited in S (S-R-6570) and also cited in the protologue, is a syntype. This material comes from Minas Gerais, Caldas, and has the same location as the lectotype.