Aspidosperma inundatum Ducke in Arch. Jard. Bot. Rio de Janeiro 3: 245. 1922. Holotype:— BRAZIL. Pará: Prope Gurupá, 13 Aug 1918, A. Ducke s.n. [A. Ducke [17195]] (MG [barcode MG017195!]; isotypes: F [barcode V0092463F image!], G [barcode G00169265 image!], K [barcode K000587681 image!], MO [barcode MO-2958527], NY [barcode 00297971 image!], P [barcode P00645103 image!], R [barcode R000007307!], RB [barcode 00535003!, barcode 00535046!], S [No. S12-16364 image!], U [barcode U0000476 image!], US [barcode 00111801 image!]). Notes — Ducke (1922) indicated the gathering “ A. Ducke 13-8-1918 flor. et fructibus vetustis, n. 17195 ” (Ducke s.n., herbarium MG No. 17195) in the prologue of A. inundatum. As explained by Ducke himself in the publication’s introduction: “The specimen numbers cited in this work refer to the Museu Paraense, whenever there is no special indication” (“La numération des spècimens d’herbier cités dans ce travail se refère a l’Herbier Amazonien du Museu Paraense, chaque foi qu’il n’y a pas d’indication spéciale.”; Ducke 1922, p. 19). Thus, since the number “17195” corresponds to a voucher of a single sheet in MG, we understand that this specimen is the holotype of A. inundatum. Woodson (1951) considered A. acanthocarpum Markgr. as a synonym of A. inundatum. Still, we disagree with that interpretation since the latter has leaves with shorter petioles (1–1.5 vs. 2 cm long) and sessile smooth follicles (vs. stipitated verrucose) with conspicuous lenticels (vs. inconspicuous). However, at the moment, we do not have enough information to decide about the name A. acanthocarpum. Therefore, we treated A. acanthocarpum as “ incertae sedis ”.

Published as part of Castello, Ana Carolina Devides, Pereira, Andreza Stephanie De Souza, Shimizu, Gustavo Hiroaki, Zuntini, Alexandre Rizzo, Simões, André Olmos & Koch, Ingrid, 2022, Taxonomy and nomenclature of Aspidosperma (Apocynaceae), pp. 239-277 in Phytotaxa 571 (3) on page 254, DOI: 10.11646/phytotaxa.571.3.1, http://zenodo.org/record/7284667