Summary: The species known today as Pseudorhipsalis amazonica was first observed by Ule in 1902 and was collected for the first by Witt in Amazonas territory, Peru, in 1903. Schumann published the name Wittia amazonica in honour of its collector. In Central America, the first plants with similar morphology were collected by Williams in 1908 and by Pittier in 1911. These plants were published as Wittia panamensis by Britton and Rose in 1913. Plants showing more similarities to the type form were collected again by Rauh in 1975. He sent living material to Europe. Following a detailed revision of the plants collected between Peru and Costa Rica, Bauer published all these forms under the name Pseudorhipsalis amazonica, dividing the morphotypes into three subspecies. Pseudorhipsalis amazonica is a bushy, climbing epiphyte, the areoles of which are poorly developed. Flowers may proliferate. Outer tepals are pink, whereas the colour of the inner tepals, as well as the morphology of the pericarpium is a key character to identify the subspecies. Pericarpium of Pseudorhipsalis amazonica subsp. amazonica is tuberculated, bears scales. It is widespread in Columbia, Ecuador, Brazil and the Amazonian side of Perú: Amazonas, Loreto, San Martín and Ucayali states. Thus, the recent floristic record from Junín state means the new Southmore record of this taxon. Herbarium material was deposited in the Botanical Garden, Eötvös Loránd University, reg. No. 30 001/2016. The cultivation of Pseudorhipsalis amazonica is among the most special one of all cacti. Its stems are poorly succulent, thus do not tolerate the drought. As obligate short-day plant, the first flowers appear in late autumn, whereas the least artificial light contamination can inhibit its flowering. Under natural conditions, temperatures below 15 °C are very rare. In turn, the taxon is hardy at 8-10 °C under the rest phase. Under greenhouse conditions, the rose colours may miss entirely from the flowers.
