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This species is accepted, and its native range is Brazil (Bahia), NW. Argentina.


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.

Apart from the occurrence in the caatinga of Bahia, there is no information on the environmental conditions under which Ruehssia ulei occurs. Because of this, the species should be assessed as Data Deficient (DD). However, taking into account that it has not been collected for more than a century and that the Brazilian semi-arid region has been subjected to long and strong anthropogenic pressure, the species may be extinct.
Brazil, in the state of Bahia. The locality corresponds to the municipality of Caldeirão Grande; but we do not have accurate information about the actual collection site.
Seasonally dry forest in the Caatinga domain.
Morphology General Habit
Plants climbing; stems glabrous
Morphology Leaves
Leaves with petiole 0.39 – 0.67 cm long; lamina 3 – 9 × 2 – 4.5 cm, ovate to elliptic, base attenuate, apex rounded, margins revolute, adaxially without colleters at the base of the main vein, chartaceous, glabrous
Morphology Reproductive morphology Flowers Calyx
Sepals c. 4.5 × 1.75 mm, ovate, apex rounded, margins ciliate, abaxially sparsely pilose, adaxially with 5 alternisepalous colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla campanulate, yellowish-green, abaxially glabrous, adaxially pilose; tube c. 3 mm long; lobes c. 3.5 × 2.25 mm, ovate, erect, apex rounded
Morphology Reproductive morphology Flowers Corona
Corona lobes c. 1.8 × 0.8 mm, lanceolate, a lower portion fused to the anther and an upper portion free, not exceeding the apex of the style-head
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 3 mm high, shortly stipitate (stipe c. 0.6 mm high), inserted in the corolla tube; style-head conical; anthers with ovate apical membranous appendix; corpusculum c. 0.17 × 0.06 mm, elliptic to oblong, apex truncate or obtuse, straight; caudicles c. 0.11 mm long; pollinia c. 0.25 × 0.16 mm, ovoid to ellipsoid
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 3 – 6 flowers, subsessile; bracts lanceolate; pedicel c. 2.6 mm long, pubescent
Ruehssia ulei can be recognised by the subsessile, pauciflorous, umbelliform inflorescences, ovate, apically rounded sepals, yellowish-green and campanulate corolla with ovate, erect lobes and by the lanceolate corona lobes. The holotype deposited in herbarium B was destroyed and, since no duplicate was found, we select its photograph deposited in the herbarium F (The Field Museum, Chicago, USA) as neotype here. The description above and illustration of floral structures are based on the original description and illustrations (Rothe 1915), supplemented by the neotype.
Collected with flowers in October; fruits not observed.
Brazil, Bahia, “Catinga bei Caldeirao”, Ule 7012 [holotype B (destroyed!); neotype: photo F0BN004091 (Ule 7012), selected here].

Native to:

Argentina Northwest, Brazil Northeast

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

First published in Kew Bull. 74(2)-30: 66 (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. Scientific Data 8: 215.


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The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at and
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families.