Rhipsalis pachyptera Pfeiff.

Segments distinctly flattened, the margins rounded, often purplish, the margins deeply scalloped. Areoles without bristles. Flowers 1-4, about 1 cm wide, whitish.

SE Brazil


R. micrantha (Kunth) DC. from Ecuador and N Peru has at least some stems flattened and with extremely shallow scalloping.

R. robusta Lem. from Brazil is similar but the segments are often 3-winged.

Source: Thompson, A, ; Forbes, S.; Spencer, R. (1997). Cactaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.

kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Caryophyllanae
order      Caryophyllales
family       Cactaceae
genus        Rhipsalis Gaertn.