Bursera ariensis

Geographic & Climate

• Geographic Coordinates: 16°30' N – 19°45' N, 98°30' W – 103°30' W (Type locality: Ario de Rosales, Michoacán, Mexico, approximately 19°12' N, 101°42' W)

• Climate Classification: Tropical Savanna / Semi-Arid Tropical Climate (Köppen: Aw / BSh)

• Habitat Characteristics: Found primarily in dry tropical deciduous forests and thorn scrub at elevations between 500 m and 1,800 m above sea level. Substrates typically consist of rocky volcanic slopes or limestone-derived soils (Leptosols) with high drainage capacity and seasonal moisture flux.

Botanical Morphology

• Diagnostic Features: Smooth, yellowish to pale grey peeling bark (cuajiote blanco / copal amarillo), yielding an aromatic resin rich in terpene volatiles (notably sabinene). Leaves are deciduous, imparipinnate, with 7–15 opposite, puberulent, oblong-lanceolate to elliptical leaflets. Inflorescences consist of short, axillary panicles carrying tiny 4- to 5-merous greenish-yellow flowers. Fruits are small, 2- to 3-valved drupaceous capsules enclosing a single seed covered by a conspicuous orange-red aril.

• Growth Habit: Deciduous pachycaul shrub or small tree growing 4 to 8 meters in height with a thickened trunk. Strictly winter-dormant (shedding leaves during the dry season); displays slow to moderate growth.

History & Etymology

• Etymology: The genus name Bursera honors German-Danish physician and botanist Joachim Burser (1583–1639). The specific epithet ariensis denotes its discovery site near the municipality of Ario (Ario de Rosales) in Michoacán, Mexico.

• Historical Context: Originally collected during Humboldt and Bonpland's expedition and published under the basionym Elaphrium ariense by Carl Sigismund Kunth in 1824. Reclassified into Bursera by Rogers McVaugh and Jerzy Rzedowski in 1965 (Kew Bulletin). Traditionally prized in southern Mexico for its aromatic copal resin used in incense and regional remedies.