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This species is accepted, and its native range is Brazil (Bahia to Rio de Janeiro).
Marsdenia suberosa (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 suberosa has a broad extent of occurrence and has been well collected. Thus, it is assessed as Least Concern: LC.
Distribution
Brazil, along the Espinhaço range, in the states of Bahia and Minas Gerais, and in the state of Rio de Janeiro.
Ecology
Rupestrian vegetation and semi-deciduous forests in ecotones between Atlantic forest and Caatinga in Bahia and Atlantic forest and Cerrado in Minas Gerais, besides hygrophilous forests in Rio de Janeiro.
Morphology General Habit
Plants climbing; stems unilaterally pubescent, glabrescent, wax peeling along some portions
Morphology Leaves
Leaves with petiole 0.3 – 2.8 cm long, glabrous or with trichomes along the groove margins; lamina 3.9 – 9.1 (14.1) × 1.9 – 4.5 (6.4) cm, elliptic, oblong or ovate, base cuneate, apex acute to cuspidate, margins revolute, adaxially with 2 – 6 colleters at the base of the main vein, coriaceous, glabrous
Morphology Reproductive morphology Flowers Calyx
Sepals 4.9 – 7.6 × 2.8 – 4.5 mm, ovate, apex obtuse to rounded, recurved, margins sparsely to not ciliate, abaxially glabrous, adaxially with c. 20 colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla slightly urceolate, abaxially greenish or greenish-white, glabrous, adaxially yellow or white, occasionally pinkish, tomentose on the upper portion of tube, glabrous along the lobes; tube 5.5 – 11 × 4 – 5 mm; lobes 4.3 – 8 × 1.9 – 4.5 mm, oblong to oblong-ovate, recurved, apex rounded, margins not ciliate
Morphology Reproductive morphology Flowers Corona
Corona lobes 2.3 – 4.5 × 1.2 – 1.88 mm, a lower portion pyramid-shaped or triangular invaginated, fused to the anther, an upper portion narrowly triangular, caudate (1.8 – 3.4 mm long), free, exceeding the apex of the style-head
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 3.6 mm high, stipitate (stipe c. 1.4 mm high), inserted in the corolla tube; style-head c. 0.8 × 0.6 mm, ovate to subconical, bilobed; anthers c. 0.62 × 0.19 mm, apical membranous appendix 0.98 – 1.4 × 0.75 – 0.81 mm, ovate; corpusculum 0.37 – 0.44 × 0.15 – 0.21 mm, ovoid, apex rounded, straight; caudicles 0.15 – 0.17 mm long; pollinia 0.58 – 0.7 × 0.18 – 0.19 mm, oblong
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 3 – 12 flowers; peduncle 0.2 – 1.3 cm long, glabrous or unilaterally pubescent; bracts 0.6 – 4 × 0.3 – 1.6 mm, ovate or triangular, margins sparsely or not ciliate; pedicel 1 – 4 mm long, unilaterally pubescent
Note
Ruehssia suberosa is characterised by the coriaceous leaves, umbelliform inflorescences, mostly with unilaterally pubescent peduncles and pedicels, ovate, recurved sepals, tubular (swollen at the base) corolla, which is abaxially greenish or whitish-green, usually yellow adaxially, tomentose on the upper portion of the tube, and corona lobes with a narrowly triangular upper portion. It is similar to R. carvalhoi, R. fontellana and R. neomanarae because of habit and floral structures (see the notes of those species). The synonyms of R. suberosa were put together by Rapini et al. (2001) because the apparent discontinuity in corolla tube length, formerly used to recognise different species, was broken by the addition of new collections.
Phenology
Collected with flowers from August to March; fruits not observed.
Type
Brazil, Rio de Janeiro, Glaziou 5940 (holotype P!; isotypes B photos in F! and G!, C!).

Native to:

Brazil Northeast, Brazil Southeast

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

Date Reference Identified As Barcode Type Status
Jan 1, 2002 Pirani, J.R. [1999], Brazil Marsdenia suberosa K000095842 isolectotype
Jan 1, 2001 Ganev, W. [1358], Brazil Marsdenia suberosa K001060818
Jan 1, 2001 Harley, R.M. [50541], Brazil Marsdenia suberosa K001060817

First published in Kew Bull. 74(2)-30: 60 (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

  • Rapini, A. (2010). Revisitando as Asclepiadoideae (Apocynaceae) da Cadeia do Espiniaço Boletim de Botânica da Universidade de São Paulo 28: 97-123.

Herbarium Catalogue Specimens
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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
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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

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