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This species is accepted, and its native range is E. Brazil to Brazil (Mato Grosso do Sul, Mato Grosso, Paraná).
A specimen from Kew's Herbarium

[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
In Brazil, Ruehssia malmeana has an area of occupation of approximately 16 km2 and is restricted to few areas of savanna in the Centre-West Region. Its possible occurrence in Bolivia and the absence of information about the environment and populational conditions preclude an accurate assessment of its conservation status. Nevertheless, considering the four collections from Brazil and possibly others from Bolívia, it is tentatively assessed as Least Concern: LC.
Distribution
Brazil, in the states of Mato Grosso and Mato Grosso do Sul, and also reported from Bolívia (Jørgensen et al. 2014).
Ecology
Savannas, with tree vegetation.
Morphology General Habit
Plants climbing; stems glabrous
Morphology Leaves
Leaves with petiole 0.6 – 2.8 cm long, glabrous; lamina 4.5 – 14.2 × 2.1 – 9.5 cm, elliptic or ovate, base cuneate, truncate or rounded, apex acute to cuspidate, margins revolute, adaxially with c. 6 colleters at the base of the main vein, papyraceous, glabrous
Morphology Reproductive morphology Flowers Calyx
Sepals 2.6 – 3 × 1.7 – 1.9 mm, ovate, apex acute to rounded, margins sparsely or not ciliate, abaxially pilose, glabrescent toward the apex, adaxially with 5 alternisepalous colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla campanulate, cream, greenish-yellow or greenish-white, abaxially glabrous, adaxially pilose in the upper middle part of the tube and lower half of the lobes; tube 2.5 – 2.8 × 3.2 – 4.5 mm; lobes 3.8 – 4 × 2.1 – 2.4 mm, oblong or ovate, recurved, apex irregularly emarginate, margins sparsely ciliate
Morphology Reproductive morphology Flowers Corona
Corona lobes 1.26 – 1.7 × 1.68 – 2.1 mm, auriculate, subdeltoid, completely fused to the anther
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 2.5 mm high, subsessile, slightly exserted from the corolla tube; style-head c. 1 × 0.8 mm, ovoid to subconical; anthers c. 0.49 × 0.15 mm, apical membranous appendix 0.98 – 1.09 × 0.93 – 1 mm, broadly ovate; corpusculum 0.41 – 0.44 × 0.17 – 0.18 mm, oblong to ovoid-oblong, apex rounded, straight; caudicles 0.15 – 0.22 mm long; pollinia 0.41 – 0.48 × 0.21 – 0.22 mm, ellipsoid to obovoid
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 3 – 25 flowers; peduncle 0.8 – 2.2 cm long, glabrous; bracts 0.7 – 1.6 × 0.4 – 0.6 mm, ovate to lanceolate, margins sparsely ciliate; pedicels 3 – 6.5 mm long, pilose
Note
Ruehssia malmeana is characterised by the elliptic to ovate leaves, umbelliform, usually long pedunculate inflorescences, abaxially pilose, ovate sepals, greenish-cream or whitish-green, adaxially pilose and cream, campanulate corolla, auriculate, subdeltoid corona lobes completely fused to the anther. It is morphologically related to R. bergii (see the notes of that species) and, even more closely allied to R. weddellii, which differs from it by the corona lobes composed of a lower portion with concave auricles fused to the anther and a narrowly triangular and caudate free upper portion exceeding the apical anther appendices and the style-head. The shorter corolla tube of R. malmeana (< 2.9 mm vs > 4.5 mm) may also help to distinguish it from R. weddellii.
Phenology
Collected with flowers from September to November; fruits not observed.
Type
Brazil, Mato Grosso, Cuiabá, Malme 1116 [lectotype S 03-2283!, selected by Morillo (1987); isolectotype S!].

Native to:

Bolivia, Brazil South, Brazil West-Central

Ruehssia malmeana (W.Rothe) F.Esp.Santo & Rapini appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1992 Ratter, J.A. [R5110], Brazil Marsdenia malmeana K000095816
Wood, J.R.I. [23620], Bolivia Marsdenia malmeana 77366.000
Wood, J.R.I. [20058], Bolivia Marsdenia malmeana 74235.000
Wood, J.R.I. [20058], Bolivia Marsdenia malmeana K000662348
Rico, L. [1492], Bolivia Marsdenia malmeana K000295435

First published in Kew Bull. 74(2)-30: 38 (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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  • Woodson jr., R. E. (1931). New South American Asclepiadaceae. Ann. Missouri Bot. Gard. 18: 557 – 563.

Kew Backbone Distributions

  • 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.
  • Zuloaga, F.O., Morrone, O. , Belgrano, M.J., Marticorena, C. & Marchesi, E. (eds.) (2008). Catálogo de las Plantas Vasculares del Cono Sur Monographs in Systematic Botany from the Missouri Botanical Garden 107: 1-3348. Missouri Botanical Garden.

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

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