Abstract
Aristolochia holostylis has long been construed as constituting a single widespread and variable species, ranging across Paraguay, Bolivia, and Brazil. However, our morphological analysis shows that populations in Bolivia, Paraguay and western Brazil differ by several constant characters of the perianth and indumentum from those in northeastern Brazil. The type specimen possesses the typical morphology of the latter populations; thus, they retain the name A. holostylis, whereas the former populations are recognized here as belonging to a new species, A. pyriflora. We provide new descriptions for both species, along with morphological comparison between them, illustration of diagnostic characters and geographic distributions, and assessment of their respective conservation statuses. The often overlooked infraspecific name Holostylis reniformis f. minor is placed in the synonymy of A. pyriflora.
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Acknowledgments
The authors are grateful to the curators of the following herbaria for making the cited specimens available for study: BHCB, CEN, COL, CONN, CTES, ESA, FI, G, HEPH, HRCB, GH, IAC, IAN, IBGE, K, L, MBML, MO, NY, P, RB, S, SJRP, SPF, UFG, UFRN, US, TEX. DF thanks Clay Dove (Florida, USA), Mauro Peixoto (São Paulo, Brazil) and Philipp Gießibl (Bavaria, Germany) for discussions on the diversity of Aristolochia holostylis and for providing photos. The Bonn University Botanic Gardens, and in particular Rebecca Hilgenhof (Edinburgh Botanic Garden) and Norbert Holstein (Natural History Museum, London), are gratefully acknowledged for enabling examination of cultivated specimens. David Prehsler (University of Vienna) kindly investigated the nomina nuda A. campanaeformis and A. cucullata in W and WU. JAL thanks the National Council for Scientific and Technological Development – CNPq for a research fellowship grant (# 303450/2016-9) and research grant (# 405553/2016-1); the Instituto Plantarum for enabling the expedition that resulted in collections of the new species, and Alessandra Ike Coan for help with the investigation of trichomes. The authors also thank Stefan Wanke and an anonymous reviewer for valuable comments on the submitted manuscript.
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Frank, D., Lombardi, J.A. & Monro, A.K. A morphological study of Aristolochia holostylis (Aristolochiaceae) reveals the presence of a new species. Brittonia 74, 227–238 (2022). https://doi.org/10.1007/s12228-022-09710-2
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DOI: https://doi.org/10.1007/s12228-022-09710-2