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Pilosocereus millspaughii, commonly called the Key Largo tree cactus, [citation needed] is a species of flowering plant in the family Cactaceae, native to Florida, The Bahamas, Cuba, Haiti, and the Turks and Caicos Islands. [1] It was first described by Nathaniel Lord Britton in 1909 as Cephalocereus millspaughii. [2]
Pilosocereus robinii is a species of cactus known by the common name Key tree-cactus. [2] It is native to the Florida Keys in the United States. [3] It also occurs in Western Cuba and the Northern Bahamas. It has been erroneously reported from Puerto Rico, [4] the Virgin Islands, [4] and Mexico. [2]
The species in question is the Key Largo tree cactus (Pilosocereus millspaughii)—a tube-like cactus plant that can grow up to 20 feet tall.
The Key Largo tree cactus (Pilosocereus millspaughii) at John Pennekamp Coral Reef State Park in 2016, with many stems chlorotic and/or collapsed.
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This cactus is a species of tree [4] which grows up to eight feet/2.4 meters tall. The stem segments are up to 40 centimeters long and are "copiously armed" with pink spines which can exceed 12 centimeters in length. The spines on the trunk all point downward and are the largest spines on the plant.
This species naturally occurs along the East Coast of the United States, including on barrier islands from the Florida Keys to coastal Massachusetts. [5] Eastern prickly pear is found in scattered locations from New Mexico and Montana eastward, [6] and is one of two cactus species native to the eastern United States, along with the related O. cespitosa. [7]
The Cactoideae are the largest subfamily of the cactus family, Cactaceae, and are widely distributed throughout the Americas. Cactaceae is the 5th most endangered plant or animal family evaluated globally by the International Union for Conservation of Nature. [1] Around 80% of cactus species belong to this subfamily. [2]