Sprawling, spiny, multibranched cactus from Baja California, found from Ensenada south to the Cape region. Also found on most of the Gulf islands and Punta Sargento in Sonora. Extremely tolerant of drought and nutrient-poor soil. Usually much wider than tall, often forming a sort of thicket to about 4-5 feet tall over extended time. 8-9 ribs, 3-9 flattened central spines. White or pinkish nocturnal flowers pollinated by hawk moths. Delicious spiny red fruit. Supports animal life and serves as a nurse plant in habitat. A large colony of mature plants is visible above the main coastal road just north of the port of Ensenada.

Called the "pitaya agria" (sour pitaya) to distinguish it from sweeter Stenocereus spp. (pitaya dulce) found to the south. Also distinct from the pitahaya (same pronunciation, different spelling) or Hylocereus which makes a sweeter fruit.

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