Heliamphora purpurascens was formally described in 2011 by botanists Andreas Wistuba, Andreas Fleischmann, Joachim Nerz, and Stewart McPherson. Prior to its classification as a distinct species, it was considered a variant of Heliamphora heterodoxa. The elevation to species status was based on its unique morphological traits and isolated habitat on Ptari Tepui.
 
Habitat Overview
This species is endemic to the summit of Ptari Tepui, a remote and flat-topped mountain in Bolívar State, Venezuela, rising to elevations of 2400–2500 meters above sea level. The summit is characterized by extremely flat terrain, constant exposure to wind and rain, and minimal vegetation. Heliamphora purpurascens grows in boggy, peaty depressions, often forming small hummocks of mixed tepui flora that resemble islands in a marsh. These conditions are harsh, with daily rainfall and cool temperatures, making the summit a unique ecological niche.
 
Range and Distribution
Heliamphora purpurascens has an extremely limited distribution, found only on Ptari Tepui and nowhere else on Earth. This tepui is part of the eastern range of the Guayana Shield, a region known for its high levels of endemism and biodiversity. The isolation of Ptari Tepui from other tepuis has led to the evolution of distinct species like H. purpurascens, which are genetically and ecologically separated from their relatives.
 
Physical Characteristics
Heliamphora purpurascens is notable for its tight rosettes of upright pitchers, which can grow up to 25 cm tall. The pitchers are elongated above the waist and often surrounded by dead ones, a trait common in nutrient-poor environments. A key distinguishing feature is its large, helmet-shaped nectar spoon, which has a wide triangular base and is sharply bent forward. This spoon is proportionally larger than in other Heliamphora species and plays a role in attracting prey. The pitchers also have a drainage hole at the waist, helping to regulate internal water levels. The plant’s texture is described as having a somewhat woody substance, and it is considered a steady grower in cultivation.