Aspidosperma riedelii Mull. Arg.
Creators: name: Castello, Ana Carolina Devides
name: Pereira, Andreza Stephanie De Souza
name: Shimizu, Gustavo Hiroaki
name: Zuntini, Alexandre Rizzo
name: Simões, André Olmos
name: Koch, Ingrid
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Gentianales
Apocynaceae
Aspidosperma
Aspidosperma riedelii

description: 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.
description: 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 265, DOI: 10.11646/phytotaxa.571.3.1, http://zenodo.org/record/7284667