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This species is accepted, and its native range is Brazil (Goiás, Mato Grosso) to Paraguay.
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
Ruehssia brasiliensis shows an extent of occurrence of approximately 19,000 km2 and is known by only five specimens, the last one collected in 1965. Although the environmental conditions at these locations and its area of occupancy are unknown, the number of localities where it has been found is less than five. In addition, the savannas in Goiás and Mato Grosso are under strong anthropogenic pressure and the native vegetation has been suppressed for the expansion of agriculture. Thus, R. brasiliensis is assessed as Vulnerable: VU B1ab(i,iii,iv) + D2.
Distribution
Central Brazil, in the states of Goiás and Mato Grosso.
Ecology
Gallery forests, forest corridors along rivers or wetlands, surrounded by drier, usually open vegetation.
Morphology General Habit
Lianas; stems ferruginous-pubescent when young, glabrescent
Morphology Leaves
Leaves with petiole 1.5 – 4.9 cm long, tomentose; lamina 5.7 – 11.9 × 3.4 – 9.9 cm, ovate, cordiform or rarely elliptic, base rounded, cordate, subcordate, truncate or obtuse, apex acuminate, margins slightly revolute, adaxially with 4 – 8 colleters at the base of the main vein, membranous, sparsely pubescent, pubescent along the veins, adaxially farinose along the main vein
Morphology Reproductive morphology Flowers Calyx
Sepals 1.27 – 1.85 × 1 – 1.3 mm, ovate, apex cuneate, margins ciliate, abaxially ferruginous-pubescent, adaxially with 5 alternisepalous colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla shortly campanulate, white, abaxially glabrous, adaxially tomentose along the lobes, pilose on the throat, glabrous on the tube base; tube 1.3 – 1.5 × 2.5 – 3.3 mm; lobes 1.3 – 2.3 × 1 – 1.8 mm, ovate to deltoid, erect, apex cuneate, margins not ciliate
Morphology Reproductive morphology Flowers Corona
Corona lobes 0.61 – 0.79 × 0.6 – 0.85, inverted V-shaped (˄), completely fused to the anther; anthers c. 0.25 × 0.11 mm, apical membranous appendix 0.67 – 1.2 × 0.64 – 0.85 mm, broadly ovate to suborbicular
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 2 mm high, subsessile, inserted in the corolla tube; style-head c. 0.55 × 1 mm, subconical; corpusculum 0.22 – 0.25 × 0.08 – 0.11 mm, oblong, apex rounded, straight; caudicles c. 0.3 – 0.36 mm long; pollinia 0.24 – 0.27 × 0.18 – 0.2 mm, obovoid.
Morphology Reproductive morphology Inflorescences
Inflorescences formed by a set of umbelliform cymes, 30 – 60 flowers; peduncle 0.3 – 5.8 cm long, ferruginous-tomentose; bracts 0.31 – 0.7 × 0.11 – 0.3 mm, ovate, margins ciliate; pedicels 2 – 9 mm long, ferruginous-pubescent
Note
Ruehssia brasiliensis can be identified by the ferruginous indument of new branches, leaves and inflorescences, widely ovate or cordiform (rarely elliptic), apically acuminate leaves, inflorescences formed by a set of (usually) long-pedunculate, umbelliform cymes, globular floral buds, white, shortly campanulate corolla, with pilose throat and erect, adaxially tomentose, ovate to deltoid lobes and inverted V-shaped (˄) corona lobes. Decaisne (1844) indicated two collection by Silva Manso (25 and 30) in the original publication of Marsdenia brasiliensis. The specimen “Silva Manso 30” is selected as lectotype of R. brasiliensis because it is deposited in G-DC, which is the herbarium indicated in the protologue, whereas “Silva Manso 25” is in P.
Phenology
Collected with flowers in November; fruits not observed.
Type
Brazil, Mato Grosso, Serra de Cuiabá, Silva Manso 30 (lectotype G-DC! selected here, photos F!, HUEFS!, US!).

Native to:

Brazil West-Central, Paraguay

Ruehssia brasiliensis (Decne.) F.Esp.Santo & Rapini appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 1975 Irwin, H.S. [10349], Brazil Marsdenia brasiliensis K000095796

First published in Kew Bull. 74(2)-30: 17 (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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Kew Backbone Distributions

  • Forzza, R.C. & al. (2012). Lista de Espécies da Flora do Brasil http://floradobrasil.jbrj.gov.br/2010/.
  • 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