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This species is accepted, and its native range is Suriname to Bolivia.
Marsdenia weddellii (E. Fourn.) Malme

[KBu]

Espírito Santo, F., Rapini, A., Ribeiro, P.L. et al. (2019). Phylogeny of the tribe Marsdenieae (Apocynaceae), reinstatement of Ruehssia and the taxonomic treatment of the genus in Brazil. Kew Bulletin 74: 30. https://doi.org/10.1007/s12225-019-9807-4

Conservation
Ruehssia weddellii has a broad distribution and is found in several localities. Thus, it is assessed as Least Concern: LC.
Distribution
Brazil, in the states of Pará, Rondônia and Tocantins (North), Bahia and Maranhão (Northeast), Goiás and Mato Grosso (Centre-West), and Minas Gerais (Southeast).
Ecology
On sandy soils, rocky outcrops and gallery forests in the Cerrado domain and, less frequently, along little rivers in the Amazon region.
Morphology General Habit
Plants climbing; stems glabrous
Morphology Leaves
Leaves with petiole 0.5 – 1.6 cm, glabrous; lamina 3.7 – 14.1 × 1.7 – 8.6 cm, elliptic or oblong-elliptic, base cuneate, occasionally rounded, apex cuspidate, rarely acute, margins revolute, adaxially with 2 – 6 colleters at the base of the main vein, papyraceous to subcoriaceous, glabrous
Morphology Reproductive morphology Flowers Calyx
Sepals 1.4 – 3.1 × 1.2 – 2.1 mm, ovate to elliptic, apex obtuse to rounded, margins ciliate, abaxially pilose, glabrescent on the upper portion, adaxially with 5 alternisepalous colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla urceolate to campanulate, white, abaxially glabrous, adaxially pilose from the upper portion of tube to the lower half of lobes; tube 3.1 – 4.6 × 2.6 – 3.9 mm; lobes 3.1 – 4.7 × 1.9 – 3.3 mm, oblong, ovate or elliptic, recurved, apex irregularly emarginate, margins sparsely ciliate
Morphology Reproductive morphology Flowers Corona
Corona lobes 3 – 3.8 × 1.4 – 1.8 mm, a lower portion with concave auricles, fused to the anther, an upper portion narrowly triangular, caudate, free, exceeding the apex of the style-head
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 3.5 mm high, subsessile, slightly exserted from the corolla tube; style-head c. 1.1 × 1.5 mm, subglobose to transversely elliptic; anthers c. 0.61 × 0.22 mm, apical membranous appendix 0.75 – 1.3 × 0.95 – 1.15 mm, broadly ovate to suborbicular; corpusculum 0.28 – 0.37 × 0.12 – 0.19 mm, ovoid to ellipsoid, apex rounded, straight; caudicles 0.15 – 0.2 mm long; pollinia 0.3 – 0.46 × 0.18 – 0.2 mm, ellipsoid to obovoid
Morphology Reproductive morphology Fruits
Follicles 12 – 12.5 × 2.5 – 3.2 cm, fusiform, glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 3 – 30 flowers; peduncle 0.5 – 3.9 cm long, glabrous or with sparse trichomes; bracts 0.5 – 3.4 × 0.2 – 0.8 mm, ovate to lanceolate, margins ciliate; pedicels 2.5 – 12.5 mm long, pilose
Note
Ruehssia weddellii is characterised by the usually long-pedunculate, umbelliform inflorescences, ovate to elliptic, abaxially pilose sepals, white, abaxially pilose, urceolate to campanulate corolla and corona lobes formed by a lower portion with concave lateral auricles and a narrowly triangular, caudate upper portion exceeding the apical anther appendices and the style-head, being exserted from the corolla tube. It is morphologically related to R. bergii and R. malmeana (see the notes for those species).
Phenology
Collected with flowers from August to May and with fruits in May, September and October.
Type
Brazil, Minas Gerais, Lagoa Santa, Warming 1821 [lectotype: C 1006774!, selected by Morillo (1987)].

Native to:

Bolivia, Brazil North, Brazil Northeast, Brazil Southeast, Brazil West-Central, Suriname

Ruehssia weddellii (E.Fourn.) F.Esp.Santo & Rapini appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jun 1, 2007 Sasaki, D. [1192], Mato Grosso Marsdenia weddellii K000447759
Jun 1, 2007 Projeto Flora Cristalino [460], Mato Grosso Marsdenia weddellii K000447758
Jan 1, 1985 Harley, R.M. [10876], Brazil Marsdenia weddellii K000095834
Jan 1, 1985 Burchell [8156], Brazil Marsdenia weddellii K000095839
Jan 1, 1985 Castro, R. [10719], Brazil Marsdenia weddellii K000095831 isolectotype
Jan 1, 1985 Burchell [7814], Brazil Marsdenia weddellii K000095835
Jan 1, 1985 Souza, R. [10422], Brazil Marsdenia weddellii K000095833
Jan 1, 1985 Gardner [3324], Brazil Marsdenia weddellii K000095836
Jan 1, 1985 Argent, G. [6677], Brazil Marsdenia weddellii K000095832
Jan 1, 1975 Traill, J.W. [534], Brazil Marsdenia weddellii K000095838
Jan 1, 1975 Traill, J.W.H. [8156], Brazil Marsdenia weddellii K000095837

First published in Kew Bull. 74(2)-30: 67 (2019)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

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  • Wanntorp, L., Gotthardt, K. & Muellner, A. N. (2011). Revisiting the wax plants (Hoya, Marsdenieae, Apocynaceae): phylogenetic tree using the chloroplast markers matK gene and psbA-trnH intergenic spacer. Taxon 60: 4 – 14.
  • White, T. J., Bruns, T. D., Lee, S. & Taylor, J. (1990). Amplification and direct sequencing of fungal ribosomal RNA genes for phylogenetics. In: M. A. Innis, D. H. Gelfand, J. J. Sninsky & T. J. White (eds), PCR protocols, a guide to methods and applications, pp. 315 – 322. Academic Press, San Diego.
  • Woodson jr., R. E. (1931). New South American Asclepiadaceae. Ann. Missouri Bot. Gard. 18: 557 – 563.

Kew Backbone Distributions

  • Boggan, J. Funck, V. & Kelloff, C. (1997). Checklist of the Plants of the Guianas (Guyana, Surinam, Franch Guiana) ed. 2: 1-238. University of Guyana, Georgetown.
  • Forzza, R.C. & al. (2012). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
  • Jørgensen, P.M., Nee, M.H. & Beck., S.G. (eds.) (2013). Catálogo de las plantas vasculares de Bolivia Monographs in Systematic Botany from the Missouri Botanical Garden 127: 1-1741. Missouri Botanical Garden.

Herbarium Catalogue Specimens
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Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Science Photographs
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/