PlantaeDB Logo
Login Sign-up

Genus Fagraea in Family Gentianaceae

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!

Fagraea (Thunb.) belongs to Gentianaceae, where it is positioned in tribe Potalieae and often united with Anthocleista and Potalia in molecular analyses (Backlund et al., 2000; Struwe et al., 2009). The genus contains approximately 65–70 species across tropical Asia and the western Pacific (van Steenis, 1984; Wong & Sugau, 1996; Govaerts et al., 2001). The type species is Fagraea fragrans Roxb., and F. fragrans var. javanica Bakh.f. is sometimes treated as a synonym (van Steenis, 1984). Members are trees, shrubs, or sometimes woody lianas with opposite or whorled leaves that lack a distinct petiole and bear interpetiolar, sheathing stipules fused into a caducous or persistent collar. The leaves are thick, often coriaceous, sometimes markedly unequal at a node. Inflorescences are usually axillary to terminal thyrses or panicles, and the showy, often fragrant flowers have a tubular to funnelform corolla with five lobes, a short corolla tube, and five exserted stamens inserted near the base. The superior ovary is typically bilocular with axile placentation, developing into an indehiscent, globose to ellipsoid drupe (van Steenis, 1984).

The center of diversity is in Malesia, with substantial richness in Borneo and New Guinea, and several endemics on Pacific islands (van Steenis, 1984; Wong & Sugau, 1996). Species occupy lowland to lower montane rainforest, often in stream corridors and swampy flats; a few reach 1,500 m. Fruit pulp appears attractive to frugivores, but detailed dispersal systems remain incompletely documented; pollination is presumed moth- or bee-mediated on the basis of floral scent and structure (van Steenis, 1984). Anatomically the wood lacks growth rings and shows raphide crystals, while the base chromosome number is x=11, recorded in Indian materials of F. ceilanica (Malik, 1969).

Subgeneric or sectional classifications are not consistently applied, although F. ceilanica has been placed in subgenus Fagraea (Jongkind, 1995). Recent phylogenies have supported Fagraea as a monophyletic group nested within Gentianaceae Potalieae, not in Loganiaceae (Backlund et al., 2000; Struwe et al., 2009). Some older accounts allied it with Loganiaceae, and species boundaries with Anthocleista in Africa have occasionally been blurred in prior treatments (van Steenis, 1984; Backlund et al., 2000), but current evidence favors its retention in Gentianaceae.

Several species are used ornamentals, and F. fragrans provides valuable, aromatic timber in Southeast Asia (van Steenis, 1984). No Fagraea species are widely regarded as invasive; some taxa persist in disturbed secondary forests.

Conservation concerns focus on habitat loss, with locally abundant populations contrasted by region-specific declines; broad-scale assessments are uneven, and island endemics remain under-surveyed (van Steenis, 1984; GBIF, 2024). Ongoing work integrating field inventory, phylogenomics, and biogeography will refine species limits and inform conservation planning (Struwe et al., 2009; POWO, 2024).

Pick a Species to see its components: