Commiphora kataf

Geographic & Climate

• Geographic Coordinates (Type Locality Range): ~14°00'N – 16°30'N, 43°00'E – 45°30'E (Syntypes collected in Yemen by P. Forsskål). Species native distribution range spans ~5°S to 18°N, 36°E to 54°E (Northeast/East Tropical Africa across to the southwestern Arabian Peninsula).

• Climate Classification: Hot Desert Climate (Köppen BWh) to Hot Semi-Arid Climate (Köppen BSh).

• Habitat Characteristics: Altitude ranging from 15 m to 1,900 m above sea level. Native to Acacia-Commiphora deciduous bushlands, dry coastal thickets, and rocky limestone or volcanic slopes. Thrives in well-drained red sandy soils, rocky gravel, or black cotton soils exposed to low annual rainfall (100–400 mm) with pronounced dry seasons.

Botanical Morphology

• Diagnostic Features: An unarmed (spineless) pachycaul tree or shrub growing up to 3–10 meters tall. Diagnostic for its striking smooth, chalky-white to silver-grey outer bark that peels away in large paper-thin sheets, revealing a photosynthetic, glossy blue-green to emerald under-bark. Leaves are predominantly trifoliolate (3 leaflets) borne on short spur shoots, with obovate to broadly elliptic leaflets featuring distinctly crenate-dentate margins. Tissues yield a fragrant, sticky oleo-gum-resin (historically associated with opopanax/bisabol) upon incision.

• Growth Habit: Strong summer-active grower with a thick, water-storing pachycaul trunk (30–50 cm in diameter). Deciduous during dry periods or low winter temperatures (drops leaves completely below 10°C–12°C). Moderate to fast growth rate in active season; forms a highly branched, swollen architectural trunk ideal for containerized caudiciform culture.

History & Etymology

• Etymology:

  • Genus Commiphora: From Ancient Greek kómmi (gum/resin) and phorós (bearing/carrying), referring to the characteristic aromatic resin produced by species in this genus.

  • Species epithet kataf: Derived from "Katāf" (كتاف) or "Qatāf," the local Arabic vernacular name recorded in Yemen for this resinous tree.

• Historical Context: First gathered and described by the Swedish naturalist Pehr (Peter) Forsskål during the Danish Expedition to Arabia Felix in 1763 (originally published as Amyris kataf). Indigenous populations along the Red Sea and Horn of Africa have harvested its aromatic resin for centuries as incense, traditional remedies, and natural livestock pest repellents.