Origin and Habitat: Ecology: The showy colours, tubular structure, and abbundant nectar of flowers suggests that this plant is ornithophilous (Pollinated by birds ). Chlorostilbon aureoventris and other hummingbird are the most frequent flower visitor but some butterfly species visit the flowers too. Melocactus paucispinusSN|11349]]SN|23701]] is often found growing, at least in some portions of its areal, along with Melocactus glaucescensSN|23685]]SN|23685]] and Melocactus concinnusSN|23701]]SN|11349]]. The overlap in the flowering period and the similarity in the guild of pollinators favour the occurrence of natural hybridization.

• Melocactus paucispinus Heimen & R.J.Paul

Description: Remarks: Melocactus paucispinusSN|23701]]SN|23701]] is self-compatible and autogamous, however presenting lower fruit set in selfing than in outcrossing, possibly due to the occurrence of inbreeding depression.