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Oreocereus trollii, commonly known as the Old Man of the Andes cactus, is a species of cacti native to Argentina and Bolivia. [ 2 ] [ 3 ] Though listed as Least Concern by the IUCN , the plant is collected extensively, and in some areas is threatened.
Oreocereus celsianus, or the old man of the mountain is a member of the family Cactaceae native to the high lands of the Andes in South America, and is named for its fluffy white hair, which may protect it from intense sunlight and extreme temperatures.
Pilosocereus leucocephalus, called old man cactus (along with a number of similar species), old man of Mexico, tuno, and woolly torch, is a species of cactus in the genus Pilosocereus, native to Mexico and Central America. [2] It has gained the Royal Horticultural Society's Award of Garden Merit. [3]
Cephalocereus senilis is a tall, columnar species with clusters of stems that may grow to 5–15 m tall; the individual stems are usually unbranched, being unable to withstand the weight of side branches adequately. The most striking feature is the shaggy coat of long, white hairs suggestive of unkempt hair on an old man.
The areoles often have long white hairs and dense spines. As they are covered with woolly white fuzz (modified spines), a few species in this genus are sometimes known as the old-man cactus, [3] [4] a generic name that also refers to Cephalocereus senilis or Espostoa lanata. More rarely, the old man of the mountain is also used for some species ...
Stenocereus thurberi, the organ pipe cactus, [3] is a species of cactus native to Mexico and the United States. The species is found in rocky desert. Two subspecies are recognized based on their distribution and height. The Organ Pipe Cactus National Monument is named for the species. Cacti are minimally adapted to particular thermal niches ...
Espostoa lanata is a columnar cactus. It looks like Cephalocereus senilis (the Old Man of Mexico) : it is a densely hairy species, covered by a warm woolly coat and well adapted to high altitudes. It is widespread in its habitat and quite variable in size and spines, and for this reason it has received several names. [2]
Eriosyce senilis, called old-man cactus along with a number of similar species, is a species of cactus in the genus Eriosyce, native to Chile. [2] It has gained the Royal Horticultural Society 's Award of Garden Merit .