ABSTRACTSix species of columnar cacti (Family Cactaceae, Tribe Cereeae) are native to the Seri region of western Sonora, Mexico. Different parts of these cacti were variously employed for food, caulking pitch, games, house-building, medicine, sealing pottery vessels, tattooing, and wine. Four large-fruited species were of major economic significance in traditional Seri culture. These are cardon (Pachycereus pringlei) organ-pipe (Lemaireocereus thurberi), pitahaya agria (Machaerocereus gummosus), and sahuaro (Carnegiea gigantea). The fruit is a favorite food and is still harvested. The fruit of certain species was dried and stored for future use, as were the seeds, which have a high oil and protein content. The seeds were ground and variously prepared. Traditionally the fruit of organ-pipe and sahuaro was used almost exclusively for wine-making. A relatively extensive vocabulary is associated with the columnar cacti. Certain species, particularly senita (Lophocereus schottii), are prominent in traditional ...