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This species is accepted, and its native range is Brazil (Espírito Santo, Rio de Janeiro).
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 loniceroides has an estimated extent of occurrence of more than 80,000 km2. It occurs only in Southeast Brazil, but is known from several populations and is a common plant on rock outcrops, mainly in Espírito Santo. Thus, it is assessed as Least Concern: LC.
Distribution
Southeast Brazil, in the states of Espírito Santo, Minas Gerais and Rio de Janeiro.
Ecology
Rocky outcrops in highlands of Atlantic forest domain.
Morphology General Habit
Shrubs erect, up to 1.8 m high; stems glabrous or pubescent
Morphology Leaves
Leaves sessile or with petiole up to 0.3 cm long, pubescent, glabrescent; lamina 3.2 – 10 × 1.7 – 6.4 cm, broadly ovate or oblong-ovate, rarely elliptic, base cordate, apex rounded or obtuse, margins revolute, adaxially with 2 – 4 colleters at the base of the main vein, subcoriaceous, glabrous
Morphology Reproductive morphology Flowers Calyx
Sepals 2 – 2.7 × 1.3 – 1.9 mm, ovate, apex obtuse, margins ciliate, abaxially glabrous or with sparse trichomes, adaxially with 5 alternisepalous colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla urceolate to slightly urceolate, pink, reddish or vinaceous, abaxially glabrous, adaxially pilose on the throat and inside the tube, glabrous along the lobes; tube 4 – 6 × 2 – 3 mm; lobes 2 – 6 × 1.4 – 1.7 mm, ovate-triangular or oblong, erect to suberect, apex obtuse, margins ciliate
Morphology Reproductive morphology Flowers Corona
Corona lobes 1.11 – 1.48 × 0.85 – 1.06 mm, triangular to ovate, completely fused to the anther
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 3.5 mm high, short-stipitate (stipe c. 0.7 mm high), inserted in the corolla tube; style-head c. 1 × 0.73 mm, conical, slightly bilobed; anthers c. 0.59 × 0.19 mm, apical membranous appendix 1.47 – 1.6 × 0.59 – 0.95 mm, long triangular; corpusculum 0.18 – 0.31 × 0.06 – 0.08 mm, narrowly ellipsoid to lanceolate, apex acute, slightly curved; caudicles 0.11 – 0.24 mm long, distally plicate; pollinia 0.38 – 0.6 × 0.1 – 0.15 mm, oblong to oblong-ellipsoid
Morphology Reproductive morphology Fruits
Follicles 5.8 – 6.5 × c. 1.3 cm, fusiform, glabrous.
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 8 – 25 flowers; peduncle 2.3 – 6.1 cm long, pubescent, glabrescent; bracts 0.6 – 1.4 × 0.4 – 1.1 mm, ovate to lanceolate, margins ciliate; pedicels 0.6 – 5.1 mm long, puberulent to pubescent
Note
Ruehssia loniceroides is characterised by the shrubby habit, broadly ovate or oblong-ovate, basally cordate leaves with short petioles (< 0.4 cm), umbelliform inflorescences, urceolate to slightly urceolate corolla, with ovate-triangular or oblong, erect to suberect lobes without appendage at the base, triangular to ovate corona lobes completely fused to the anther and pollinaria with a narrowly elliptic to lanceolate corpusculum and oblong to oblong-ellipsoid pollinia. The habit, inflorescences and flowers are similar to those of R. caatingae (see the notes of that species).
Phenology
Collected with flowers practically during the whole year, except in July, and with fruits from November to June.
Type
Plant collected in Brazil and cultivated in Liverpool Garden [lectotype: Hooker (1826: tab. 2699), selected here (after Santos 2013, unpublished MSc thesis)].

Native to:

Brazil Southeast

Ruehssia loniceroides (Hook.) F.Esp.Santo & Rapini appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Glaziou, A. [12953], Brazil Marsdenia loniceroides K000095803
Lira, S.S. [98], Brazil Marsdenia loniceroides K000095805 isolectotype
Lira, S.S. [75], Brazil Marsdenia loniceroides K000095804
Miers, J. [3787], Brazil Marsdenia loniceroides K000095808
Villarouco, F.M.O. [131], Brazil Marsdenia loniceroides K000095806
Fevereiro, V.P.B. [728], Brazil Marsdenia loniceroides K000095807
Glaziou, A. [13472], Brazil Marsdenia loniceroides K000095802

First published in Kew Bull. 74(2)-30: 34 (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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  • 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

  • Monteiro de Barros, A.A., de Andrade Ribas, L. & Dunn Araujo, D.S. (2009). Trepadeiras do Parque Estadual da Serra do Tiririca, Rio de Janeiro, Brasil Rodriguésia; Revista do Instituto de Biologia Vegetal, Jardim Botânico e Estaçao Biologica do Itatiaya 60: 681-694.

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