Taxonomy and nomenclature of Aspidosperma (Apocynaceae) Author Castello, Ana Carolina Devides 0000-0002-8730-8264 Departamento de Ciências Agrárias e Naturais, Universidade do Estado de Minas Gerais, CEP 38302 - 192, Ituiutaba, MG, Brazil ana. castello @ uemg. br; https: // orcid. org / 0000 - 0002 - 8730 - 8264 & Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas - UNICAMP, Rua Monteiro Lobato 255, CEP 13083 - 862, Cidade Universitaìria Zeferino Vaz, Campinas, SP, Brazil ana.castello@uemg.br Author Pereira, Andreza Stephanie De Souza Pós-graduação em Biologia Vegetal, Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas & Pós-graduação em Biodiversidade, Instituto de Ciências e Tecnologia das Águas, Unidade Tapajós, Universidade Federal do Oeste do Pará - UFOPA, Rua Vera Paz s. n., CEP 68040 - 255, Santarém, PA, Brazil Author Shimizu, Gustavo Hiroaki Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas - UNICAMP, Rua Monteiro Lobato 255, CEP 13083 - 862, Cidade Universitaìria Zeferino Vaz, Campinas, SP, Brazil Author Zuntini, Alexandre Rizzo Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas - UNICAMP, Rua Monteiro Lobato 255, CEP 13083 - 862, Cidade Universitaìria Zeferino Vaz, Campinas, SP, Brazil & Royal Botanic Gardens - Kew, Kew Green, Richmond, Surrey, TW 9 3 AE, U. K. Author Simões, André Olmos Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas - UNICAMP, Rua Monteiro Lobato 255, CEP 13083 - 862, Cidade Universitaìria Zeferino Vaz, Campinas, SP, Brazil Author Koch, Ingrid Departamento de Biologia Vegetal, Instituto de Biologia, Universidade Estadual de Campinas - UNICAMP, Rua Monteiro Lobato 255, CEP 13083 - 862, Cidade Universitaìria Zeferino Vaz, Campinas, SP, Brazil text Phytotaxa 2022 2022-11-04 571 3 239 277 http://dx.doi.org/10.11646/phytotaxa.571.3.1 journal article 10.11646/phytotaxa.571.3.1 2f0bde50-8a71-4f78-85a9-3a3b477c2590 1179-3163 7284667 Aspidosperma riedelii Müll.Arg. in Mart. & auct. suc., Fl. Bras. 6(1): 56. 1860 . ≡ Aspidosperma riedelii subsp. riedelii . ≡ Thyroma riedelii (Müll.Arg.) Miers, Apocyn. S. Am. : 26. 1878 . Lectotype (first-step lectotype designated by Woodson in Ann. Missouri Bot. Gard. 38(2): 152. 1951 ; second-step lectotype designated here ):— BRAZIL . São Paulo : Ad Cataracta prope Ytu et prope Ypanema , Dec 1825 , L. Riedel 2771 ( W [No. W0038999 image!]; isolectotypes: G [barcode G00169342 image!], NY [barcode 00023375 image!], P [barcode P00639552 image!], RB [barcode 00535078!], SPF [fragment] [barcode SPF100000!]). B†, F negative No. 4427 image!. = Aspidosperma reductum (Hassl.) Woodson in Ann. Missouri Bot. Gard. 38(2): 156. 1951 . ≡ Aspidosperma riedelii subsp. reductum Hassl. in Repert. Spec. Nov. Regni Veg. 12(325/330): 262. 1913. Holotype :— PARAGUAY . [ Cordillera ]: Cordillera de Altos , 28 Oct 1902 , K. Fiebrig 337 [Herb. Hassler] (G [barcode G00108776 image!]; isotypes: E [barcode E00259706 image!], F [barcode V0092480 F image!], G [barcode G00108777 image!], HBG [barcode HBG524514 image!], K [barcode K000587672 image!], L [barcode L0004436 image!], P [barcode P00639553 image!], SI), syn. nov . “ Aspidosperma riedelii var. genuinum ” Hassl. in Repert. Spec. Nov. Regni Veg. 12(325/330): 262. 1913, a designation not validly published. “ Aspidosperma riedelii var. genuinum f. microphyllum ” Hassl. in Repert. Spec. Nov. Regni Veg. 12(325/330): 262. 1913, a designation not validly published. “ Aspidosperma riedelii subsp. guaraniticum ” Hassl., mss. in sched. Notes —Among the two gatherings mentioned in the protologue of A . riedelii by Müller-Argoviensis (1860a) , Woodson (1951) selected Riedel 2771 as the type. However, since this gathering has more than one specimen , it was necessary to narrow Woodson’s (1951) typification by electing the material with follicles as the second-step lectotype of A . riedelii (W No. W0038999) (ICN article 9.17; Turland et al. 2018 ). Lastly, according to the ICN article 24.3 ( Turland et al. 2018 ), designations of infraspecific taxa that were intended to include the type of the species to which they were assigned were not validly published whenever they had infraspecific epithets like “ genuinum ” (e.g., “ A . riedelii var. genuinum ” and “ A . riedelii var. genuinum f. microphyllum ”). Woodson (1951) considered A . riedelii as a synonym of A . pyricollum Müll.Arg. , but Handro (1962) reestablished the former. We agree with the reestablishment of A . pyricollum because A . riedelii presents spatulate leaves ( vs. elliptic or obovate) with brochidodromous venation ( vs. eucamptodromous), flowers with longer calyx lobes (2–3 vs. 0.9–1.1 mm long), and smaller follicles (1.8–2.2 × 1.1–1.3 vs. 3.6–4 × 2.6–3 cm ). Furthermore, after analyzing specimens of A . reductum and A . riedelii , we observed that both have leaves with brochidodromous venation, sessile fasciculate inflorescences, flowers with unequal calyx lobes, and corolla lobes shorter than the tube (2×). So, we consider A . reductum as a synonym of A . riedelii .