Catasetum × grasineideae (Orchidaceae: Catasetinae), a new nothospecies from Brazilian Amazon and taxonomic notes for the genus Author Krahl, Dayse Raiane Passos 0000-0003-2899-9453 Universidade Federal do Amapá, Programa de Pós-Graduação em Biodiversidade e Biotecnologia da Rede BIONORTE, Rodovia Josmar Chaves Pinto, Km 2, Jardim Marco Zero, 68903 - 419, Macapá, AP, Brazil. & dayseraiane @ hotmail. com; https: // orcid. org / 0000 - 0003 - 2899 - 9453 dayseraiane@hotmail.com Author Schmal, Philippe 0000-0003-2993-6884 Program of Forest Ecology and Management, Albert Ludwig University of Freiburg, Friedrichstr. 39, 79098, Freiburg, Germany. & ppschmal @ yahoo. com. br; https: // orcid. org / 0000 - 0003 - 2993 - 6884 ppschmal@yahoo.com.br Author Chiron, Guy 0000-0003-0971-4715 Université de Lyon 1, Herbiers, F- 69622, Villeurbanne Cedex, France. & g. r. chiron @ wanadoo. fr; https: // orcid. org / 0000 - 0003 - 0971 - 4715 g.r.chiron@wanadoo.fr Author Silva, João Batista Fernandes Da 0000-0002-1003-1041 Mineração Rio do Norte, Rua Rio Jari s / n °, 68275 - 000, Porto Trombetas, Oriximiná, PA, Brazil. & jb. bina @ gmail. com; https: // orcid. org / 0000 - 0002 - 1003 - 1041 jb.bina@gmail.com Author Krahl, Amauri Herbert 0000-0001-7862-9624 Instituto Nacional de Pesquisas da Amazônia, Programa de Pós-Graduação em Botânica, Departamento de Botânica, Av. André Araújo, 2936, Aleixo, 69060 - 001, Manaus, AM, Brazil. & amaurikrahl @ hotmail. com; https: // orcid. org / 0000 - 0001 - 7862 - 9624 amaurikrahl@hotmail.com Author Cantuária, Patrick De Castro 0000-0002-3676-7866 Instituto de Pesquisas Científicas e Tecnológicas do Estado do Amapá, Laboratório de Taxonomia Vegetal, Rodovia Juscelino Kubitschek, Km 10, 68903 - 970, Macapá, AP, Brazil. & patrickcantuaria @ gmail. com; https: // orcid. org / 0000 - 0002 - 3676 - 7866 patrickcantuaria@gmail.com text Phytotaxa 2023 2023-04-26 594 2 89 104 http://dx.doi.org/10.11646/phytotaxa.594.2.1 journal article 54088 10.11646/phytotaxa.594.2.1 b4fbdf3b-8072-4b64-beac-1268d056bf41 1179-3163 7891982 5. Catasetum naso Lindley (1843b : Misc. 71). Type :—Origin unknown, “received last year from Linden by Mr. Rucker ( holotype : K ) . = Catasetum sanguineum Lindley & Paxton (1851: 168) , syn. nov. , Type :—“Central America”. Ex Hort. T. Brocklehurst ( lectotype designated by Romero & Jenny (1993) : K). Taxonomic Note: — Catasetum naso Lindley (1843b : Misc. 71) and C. sanguineum Lindley & Paxton (1851: 168) are two species described in the middle of 19 th century and, from that time, several morphological variations were observed which caused each of them to have at least three different variations described. However, all these variations present morphological features in common (see Hooker 1854 , Dunsterville & Garay 1961 ). In a general way C. naso and C. sanguineum only differ by the lip dimensions (lip larger with an apex broader vs . lip smaller with an apex more tapered), by basal margins of the lip more lacerate and pedicel longer in C. sanguineum ( Lindley 1843b , Lindley & Paxton 1851). However, we think that these characters may vary in an acceptable way among individuals and among populations ( i.e . intraspecific variation). In addition, both taxa have virtually the same geographical distribution ( Govaerts et al. 2022 ). Therefore, we consider them as conspecific and we propose the synonymization of C. sanguineum , retaining the older name C. naso . Additional specimens examined ( C. naso ):— Origin unknown, no date, s. coll. s.n. (K000588878, photograph!); Origin unknown, no date, s. coll. s.n. (K001458456, photograph!); VENEZUELA : Est. Trujilo, 15 august 1947 , J. Renz 4257 (RENZ, photograph!); idem, J. Renz 4272 (RENZ, photograph!); idem, 11 september 1947 , J. Renz 4488 (RENZ, photograph!); idem, J. Renz 4489 (RENZ, photograph!); idem, 27 september 1952 , J. Renz 7827 (RENZ, photograph!); idem, 10 september 1958 , J. Renz 9169 (RENZ, photograph!). Additional specimens examined ( C. sanguineum ):— USA (specimens in cultivation): Florida : Alachua Country , ex. Hort. , living material obtained from Craing Morrell at U. of Florida. F1226, 03 october 1987 , H.G. Hills 87089 (FLAS-181559, photograph!) ; idem, ex. hort. Living material obtained from Lester Poole , 22 october 1987 , H. G. Hills 87088 (FLAS-181557, photograph!) ; idem, cultivated, without locality, flowered in cultivation at the Univ. of Florida , 01 december 1993 , W.C. Whitehill & W.M. Whitten 91527 (FLAS-181738, photograph!) ; idem, cultivated, obtained from Craig Morrell , flowered in cultivation at the Univ. of Florida , 04 january 1994 (FLAS-181558, photograph!); Pennsylvania : Allegheny Country , Pittsburgh , Phipps Conservatory , Orchid Greenhouse , 10 january 1989 , E. Lobdell 976 (CM-342563, photograph!) .