The trunk is up to 24 cm thick, with branches sticking out at right angles, all covered with small leaves (1.5-4 cm). The boojum can grow to a height of 20 m. The flowers bloom in summer and autumn; they occur in short racemes, and are creamy yellow, with a honey scent.
The common name of BoojumTree was given by Godfrey Sykes of the Desert Botanical Laboratory in Tucson, Arizona.
The BoojumTree grows on rocky hillsides and alluvial plains from the southern Sierra de San Pedro Mártir, to the Volcán Las Tres Virgenes, and on Angel de la Guarda Island.
The Boojum forms forests in the Vizcaíno region and often occurs with yuccas, Ocotillo, and Cardón.