Pilosocereus alensis, the Sonoran old man cactus, is a species of cactus native to Western Mexico, from Sonora south to Jalisco.[1] The hairs protect the flower buds. Flowers open at night in June and give off the odor of ammonia, attracting bats for pollination. The juicy fruit is tasty.[2]

Pilosocereus alensis
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Caryophyllales
Family:	Cactaceae
Subfamily:	Cactoideae
Genus:	Pilosocereus
Species:	P. alensis
Binomial name
Pilosocereus alensis (F.A.C.Weber ex Rol.-Goss.) Byles & G.D.Rowley
Synonyms
Cephalocereus alensis (F.A.C.Weber) Britton & Rose Cephalocereus guerreronis (Backeb.) Buxb. Cereus alensis (Weber) Vaupel Pilocereus alensis F.A.C.Weber ex Rol.-Goss. Pilocereus guerreronis Backeb. Pilosocereus guerreronis (Backeb.) Byles & G.D.Rowley

References

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[es] Pilosocereus alensis