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

[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
The only population of Ruehssia trisegmentata in the state of Bahia occurs on the margin of a local road, close to the municipality's headquarters, and therefore, is under direct anthropogenic influence, mainly by fire, deforestation and cattle breeding. The absence of any data from its occurrence in the state of Ceará led Espírito Santo et al. (2018a) to classify this species as Data Deficient (DD). However, a less conservative assessment must take into account that there are only two distant locations known for this species, which would already be sufficient to classify it as Vulnerable: VU D2. The area of occupancy, probably smaller than 10 km2, its high fragmentation and the observed decline in the quality of its habitat in Bahia qualify the species as Critically Endangered: CR B2a,b(iii).
Distribution
Brazil, in Morpará, state of Bahia, and Quixeramobim, state of Ceará.
Ecology
Seasonally dry forests in the Caatinga domain.
Morphology General Habit
Plants climbing; stems glabrous, pubescent when young
Morphology Leaves
Leaves with petiole 0.5 – 2.2 cm long, pubescent or with sparse trichomes; lamina 2.8 – 9 × 1.4 – 4 cm, elliptic or subobovate, base cuneate, apex acuminate, cuspidate or acute, margins revolute, adaxially with 2 – 4 colleters at the base of the main vein, fleshy, glabrous or sparsely pubescent
Morphology Reproductive morphology Flowers Calyx
Sepals 3 – 5 × 1.9 – 2.2 mm, elliptic to ovate, apex cuneate, margins ciliate, abaxially sparsely pubescent, adaxially with 5 alternisepalous colleters at the base of calyx
Morphology Reproductive morphology Flowers Corolla
Corolla broadly campanulate, green to yellowish-green, abaxially glabrous, adaxially glabrous or occasionally with short and sparse trichomes; tube 4.5 – 5.8 × 4.6 – 6.4 mm; lobes 6.3 – 8 × 3.6 – 6.7 mm, oblong or broadly ovate, patent, apex rounded to irregularly emarginate, margins ciliate
Morphology Reproductive morphology Flowers Corona
Corona lobes 6.7 – 7.6 × 1.8 – 2.3 mm, a lower portion suborbicular, concave, or triangular invaginated, fused to the anther, a middle portion rhomboidal or triangular and an upper portion narrowly triangular, falcate, free, exceeding the apex of the style-head
Morphology Reproductive morphology Flowers Gynostegium
Gynostegium c. 7 mm high, stipitate (stipe c. 1 mm high), slightly exserted from the corolla tube; style-head c. 1.5 × 2 mm long, capitate; anthers c. 0.45 × 0.26 mm, apical membranous appendix 0.65 – 0.8 × 0.9 – 1.3 mm, transversely elliptic to subrectangular; corpusculum 0.4 – 0.44 × 0.24 – 0.28 mm, ovoid to oblong, apex rounded, straight; caudicles 0.24 – 0.27 mm long; pollinia 0.46 – 0.51 × 0.25 – 0.34 mm, ellipsoid
Morphology Reproductive morphology Inflorescences
Inflorescences umbelliform, 2 – 7 flowers; peduncle 0.65 – 1.4 cm long, sparsely pubescent; bracts 0.7 – 2.5 × 0.3 – 0.85 mm, deltoid, margins ciliate; pedicels 4 – 9 mm long, pubescent
Note
Ruehssia trisegmentata is characterised by the pauciflorous inflorescences, green to yellowish-green, broadly campanulate corolla, with patent lobes larger than tube, trisegmented corona lobes formed by a suborbicular and concave or triangular and invaginated lower portion, a rhomboid or triangular central portion and a narrowly triangular, falcate apical portion exceeding the apex of the style-head and exserted from the corolla tube.
Phenology
Collected with flowers in November and December; fruits not observed.
Type
Brazil, Bahia, Morpará, Espírito Santo et al. 231 (holotype HUEFS!; isotypes K!, NY!, RB!).

Native to:

Brazil Northeast

Ruehssia trisegmentata (F.Esp.Santo & A.P.B.Santos) F.Esp.Santo & Rapini appears in other Kew resources:

First published in Kew Bull. 74(2)-30: 64 (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 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