Three photos copyright and courtesy of João Marcelo Alvarenga Braga 12/2017
R. triangularis growing with Coleocephalocereus fluminensis (Thanks to Daniela Zappi for identification)
| From Calvente thesis 2010 treated
as a legitimate species
12. RHIPSALIS TRIANGULARIS Werderm., Repert. Spec. Nov. Regni Veg. 42: 3. 1937.
Type: BRAZIL. Rio de Janeiro: Rio de Janeiro, Parque Natural Municipal da Prainha, 2003, Calvente 37 (neotype, here designated: RUSU; isoneotype: R, RB).
Lithophyte in open habitat, 0.5-1 m long, branching apical. Stem segments,
triangular to tetrangular, rarely pentangular in longitudinal section,
1-3(-4) mm diam, olive green, succulent, stiff, monomorphic, 6-24 cm long,
base attenuate, apex truncate, wings 3-4(-5), (0.5-)1 -2(3\ cm wide, margin
serrate to crenate, plane, with 4-7 mm projections, midrib 5-7 mm diam,
Notes; R triangularis is well characterized by the large flowers, long style and stem segments with deeply serrate margins. This taxon was described from a cultivated specimen that was sent from the Botanical Garden of Rio de Janeiro to the Dahlem Botanical Garden. However, this specimen was lost requiring the establishment of a neotype. The lack of a type specimen contributed for the uncertainty on the correct application of this name. However, the recent discovery of new populations of R. triangularis in Rio de Janeiro (Calvente and Andreata 2007), allowed for a more careful examination of R. triangularis in the field and a better circumscription of this taxon. This species is closely related to another species from the inselbergs of Rio de Janeiro (R. cereoides); however, these taxa have non-overlapping distributions.
Habitat and distribution: Occurs in southern coastal inselbergs of Rio de Janeiro (Rio de Janeiro, Brazil). It is currently only known from the Natural Municipal Park of Prainha (Rio de Janeiro, Brazil).
R. triangularis Werdermann.
Info from Backeberg’s Lexicon 1975
Habitat - Brazil (locality not known).