PlantaeDB Logo
Login Sign-up

Genus Boswellia in Family Burseraceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Boswellia (Burseraceae) is a genus of resinous trees and shrubs with about 27 accepted species, native to arid and semi-arid regions of Northeast Africa and the Arabian Peninsula, with extensions into western India. The type species is Boswellia serrata Roxb. (POWO, 2024). Morphologically, most species are small trees with papery or fibrous, aromatic bark and deciduous, odd-pinnate leaves clustered at branch tips; leaflets are entire to serrate, usually opposite to subopposite. Inflorescences are slender terminal or axillary panicles with small, often greenish-white or pinkish flowers; the calyx is 5-lobed, the corolla has 5 spreading petals, the androecium typically comprises two whorls of stamens (10 in total), and the ovary is inferior to semi-inferior with 3–5 chambers containing two axile ovules per chamber. The fruit is a drupe with a stony endocarp; dehiscence along preformed sutures can liberate distinct pyrenes in some species. A powdery exudate and resinous canals are diagnostic. The genus exhibits remarkable diversity in the Horn of Africa and southwestern Arabia, with multiple narrowly endemic taxa (e.g., B. popoviana, B. pirottae) occurring in escarpments and limestone outcrops. Typical habitats are rocky slopes and dry woodlands between 100 and 2,000 m; endemics are often confined to single massifs or islands (Thulin et al., 2008).

Pollination and dispersal have been documented as generalized insect pollination and ballistic fruit dehiscence in some taxa; however, systems vary among species (Baker and Oliver, 1967; Thulin et al., 2008). A base chromosome number of x=13 has been repeatedly reported in Burseraceae, consistent with counts in Boswellia (Silva et al., 2012). Traditional sectional treatments using fruit morphology (number of pyrenes) have been shown to be incongruent with molecular phylogenies, which support the separation of Boswellia from other Burseraceae genera while demonstrating paraphyly within Boswellia under older circumscriptions (Weeks et al., 2005). Recent molecular work separates Triomma and allies but retains Boswellia as defined by its resins, resin canals, and the presence of alpha- and gamma-boswellic acids (Vollesen et al., 2018; HMNH, 2020). Alternative micro-morphological classifications exist but have limited phylogenetic support (Beentje, 1994). As a result, infrageneric ranks are unstable and not widely adopted at present (WFO, 2024).

Boswellia has substantial non-medicinal relevance: B. sacra and B. serrata supply frankincense (olibanum), a valued incense and cultural commodity; several taxa are grown ornamentally, and certain species have minor timber use. Heavy tapping, habitat degradation, and climate stress threaten many populations, especially island endemics (Vollesen et al., 2018). Focused population surveys, coupled with DNA-based lineage delimitation, are needed to refine conservation priorities in light of ongoing taxonomic adjustments (Vollesen et al., 2018; WFO, 2024).

Pick a Species to see its components: