| Pilosocereus leucocephalus
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| Scientific classification
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| Kingdom:
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Plantae
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| Clade:
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Tracheophytes
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| Clade:
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Angiosperms
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| Clade:
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Eudicots
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| Order:
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Caryophyllales
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| Family:
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Cactaceae
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| Subfamily:
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Cactoideae
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| Genus:
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Pilosocereus
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| Species:
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P. leucocephalus
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| Binomial name
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Pilosocereus leucocephalus
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| Synonyms
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- Cephalocereus cometes (Scheidw.) Britton & Rose
- Cephalocereus leucocephalus (Poselg.) Britton & Rose
- Cephalocereus leucocephalus f. cristatus P.V.Heath
- Cephalocereus maxonii Rose
- Cephalocereus palmeri Rose
- Cephalocereus palmeri f. cristatus P.V.Heath
- Cephalocereus sartorianus Rose
- Cephalocereus tehuacanus (Weing.) Borg
- Cephalophorus palmeri (Rose) Boom
- Cereus cometes Scheidw.
- Cereus flavicomus Salm-Dyck
- Cereus houlletii (Lem.) Mottet
- Cereus jubatus Salm-Dyck ex C.F.Först.
- Cereus maxonii (Rose) Vaupel
- Cereus tehuacanus (Weing.) Werderm.
- Cereus victoriensis Vaupel
- Pilocereus cometes (Scheidw.) Mittler ex C.F.Först.
- Pilocereus flavicomus (Salm-Dyck) C.F.Först. & Rümpler
- Pilocereus forsteri Sencke ex Lem.
- Pilocereus houlletii Lem.
- Pilocereus jubatus Salm-Dyck
- Pilocereus leucocephalus Poselg.
- Pilocereus marschalleckianus Zeiss.
- Pilocereus marschalleckianus var. picta Zeiss.
- Pilocereus maxonii (Rose) A.Berger
- Pilocereus palmeri (Rose) F.M.Knuth
- Pilocereus sartorianus A.Berger
- Pilocereus tehuacanus Weing.
- Pilosocereus cometes (Scheidw.) Byles & G.D.Rowley
- Pilosocereus leucocephalus subsp. palmeri (Rose) Scheinvar
- Pilosocereus maxonii (Rose) Byles & G.D.Rowley
- Pilosocereus palmeri (Rose) Byles & G.D.Rowley
- Pilosocereus palmeri var. sartorianus (Rose) Lodé
- Pilosocereus palmeri var. victoriensis (Vaupel) Backeb.
- Pilosocereus sartorianus (Rose) Byles & G.D.Rowley
- Pilosocereus tehuacanus (Weing.) Byles & G.D.Rowley
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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. It has gained the Royal Horticultural Society's Award of Garden Merit. Pilosocereus leucocephalus functions as a keystone species in dry landscapes found in Mesoamerica. The fruit this cactus produces is relied upon as a source of hydration and sugar in arid areas by frugivores such as birds, bats, and even some reptiles.