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 ”.