Melocactus lemairei

Melocactus lemairei was described by M. Chevalier de Monville, Charles Antoine Lemaire, and Friedrich Anton Wilhelm Miquel, and published in L'Horticulteur Universel.[5]

Melocactus lemairei is a cylindrical or slightly pyramid-shaped green cactus that can grow up to 20 cm (8 inches) in height, and 20 to 30 cm (8 to 12 inches) in diameter. It has between 9 and 10 ribs with 8 to 10 spines each. These spines are yellow to brown in color, and can reach anywhere from 2 to 3 cm (1 inch) in length. The cephalium is brown, with white wool and thorn-like bristles, and grows up to 10 cm (4 inches). The flowers are pink, and grow to 2 cm long; they also have a diameter of 1.5 cm, protruding up to 1.2 cm from the cephalium. The pink fruits are up to 2 cm long.

Melocactus lemairei is endemic to Hispaniola (split between the Dominican Republic and Haiti). It grows in dry, rocky soils, and also occurs in humid depressions. It can also be found on sea cliffs and rocky offshore islands. There is a notable population around Lake Enriquillo and its island, Isla Cabritos.

Melocactus lemairei is listed as Near Threatened on the IUCN Red List, due to it being found in less than 10 locations on Hispaniola, as well as being threatened by collection from the wild, and land clearing for agriculture, industry, and urban development.

Based on current knowledge of habitat degradation in Haiti, as well as it only containing one known population of this species (in and around Gonaïves), Melocactus lemairei is probably under threat in Haiti. This species is threatened by collection from the wild in the Dominican Republic; the cactus is often used as medicine and sold.