Distinct, tapered succulent stem with light gray bark, and horizontal, spiny branches produces leaves when sufficient moisture is available and clusters of white, fragrant flowers on the tops of primary stems in mid to late summer. Although the Boojum is endemic to Baja, California and is not truly a Sonoran native, there is a small population on the Gulf coast of Sonora. In Baja, the plants often topple from high winds and some bend and form loops. Different populations of insect species pollinate in different years in response to environmental cues that are not fully understood.