Harrisia portoricensis

Harrisia portoricensis is a species of cactus in the genus Harrisia. Its common names include higo chumbo and Puerto Rico applecactus.

Description
Harrisia portoricensis grows upright with only a few branches and reaches heights of 2 to 3 meters. The slender shoots have a diameter of 3 to 4 centimeters. There are eleven rounded ribs, separated from each other by shallow furrows. The 13 to 17 grayish white thorns have a darker tip and are 2 to 3 centimeters long.

The flowers are up to 15 centimeters long. The yellow, spherical to egg-shaped fruits reach a diameter of 4 to 6 centimeters.

Distribution
It is endemic to Puerto Rico, where it is known from three smaller islands off the coast of the main island. The population is estimated at 59,000 on Mona Island, 148 individuals on Monito Island, and only 9 on Desecheo Island. It grows on in scrubland on exposed limestone at elevations of 0-150 meters.

Taxonomy
The first description by Nathaniel Lord Britton was published in 1909. The specific epithet portoricensis refers to the occurrence of the species in Puerto Rico. A nomenclature synonym is Cereus portoricensis (Britton) Urb. (1910).