Product Description
Bursera microphylla, commonly known as elephant tree, is a remarkable small pachycaul tree native to the Sonoran Desert region, with a range spanning southern Arizona and California in the United States south through Baja California and Sonora in Mexico. It grows on rocky desert slopes and bajadas in some of the hottest, driest habitats inhabited by any member of the genus, and it is celebrated for its swollen trunk, refined fine-textured foliage, and aromatic resin.
The species name microphylla, meaning "small-leaved," refers to the diminutive size of the leaflets, which gives the canopy a delicate, almost gauzy texture quite different from the more robust foliage of many other Bursera species. The plant develops a thick, swollen trunk that thickens with age into a clearly pachycaul form, often with a markedly tapered base, and the bark is smooth, papery, and pale whitish to gray, exfoliating in thin sheets to reveal greenish photosynthetic tissue beneath. This ability to photosynthesize through the bark is an important adaptation to the harsh desert conditions of its native range.
When the bark is wounded or the leaves are brushed, Bursera microphylla releases a fragrant resin and essential oil with the sharp citrus-pine quality characteristic of the genus, lending the plant a distinctive presence. Small inconspicuous flowers appear in spring or early summer, typically cream to pale yellow, borne in small clusters. As with most Bursera species, the plants are dioecious, with male and female flowers borne on separate individuals, so cross-pollination between two plants is generally required for seed production. Pollinated female flowers develop into small dry drupes that split at maturity to reveal a single seed partly enclosed by a brightly colored red or orange aril, attracting birds for dispersal.
In cultivation, Bursera microphylla requires full sun to very bright light, hot summer temperatures, and an exceptionally fast-draining mineral-rich soil mix. It is a strict summer grower and benefits from regular watering once the leaves emerge, with a strict dry rest period through the cool months after leaf drop. Overwatering during dormancy is the single most common cause of trouble, particularly in winter, so a clear seasonal cycle and excellent drainage are essential.
The combination of dramatic pachycaul form, fine-textured foliage, fragrant resin, and association with the iconic Sonoran Desert landscape makes Bursera microphylla one of the most evocative and rewarding small trees a collector can grow.
