PlantaeDB Logo
Login Sign-up

Genus Chrysojasminum in Family Oleaceae

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!

Chrysojasminum (Banfi) belongs to the olive family Oleaceae and comprises approximately 11 species (POWO, 2024; WFO, 2024). The genus is distributed from the Mediterranean and Macaronesia through the Middle East to Central Asia and the Indian subcontinent, occurring in scrub, maquis, rocky slopes, and open woodland (Green, 1996). Its type species is C. fruticans, which anchors the circumscription established by Banfi’s sectional treatment of Jasminum (Banfi, 2014).

Morphologically Chrysojasminum is defined by a combination of features that separate it from the closely allied, predominantly white‑flowered Jasminum s.str. Species are woody shrubs or scramblers with opposite or rarely whorled leaves and usually persistent calyces with short, unequal teeth. The corolla is typically yellow, with five lobes that are usually spreading to reflexed and often markedly longer than the tube, giving the flower a characteristic stellate profile; the anthers are versatile (Banfi, 2014; Green, 1996). The ovary is superior, bicarpellary and bilocular, with axile placentation, and the fruit is a schizocarpic berry with 1–2 seeds per locule (Green, 1996; P.S. Green et al., 2011).

Species richness concentrates around the Mediterranean, the Near East, and Central Asia, with local endemics such as C. Sonderii in South Africa (POWO, 2024). Habitats range from sea level to several thousand metres in the Himalayas, with many species favouring dry, sun‑exposed sites (Green, 1996).

Chromosome counts consistent with x=13 have been reported for several members of the former Jasminum humile complex, indicating a shared base number within the lineage, although counts for the full Chrysojasminum clade remain incomplete (Kumar & Subramanian, 1986). Pollination and seed dispersal are not well documented in the genus; generalisation from Oleaceae suggests entomophily and fleshy‑fruited endozoochory, but this remains unconfirmed for many taxa.

Recent taxonomic work segregated Chrysojasminum from Jasminum, recognizing it at generic rank with informal infrageneric groups (Banfi, 2014). The treatment has been adopted by major online resources (POWO, 2024; WFO, 2024), although some floras retain wider circumscriptions and continue to place many species in Jasminum (Green, 1996; P.S. Green et al., 2011). Generic limits are stable for the principal yellow‑flowered taxa, but synonymy and specific status for several regional entities remain under revision.

Several shrubby species are cultivated as ornamentals—most prominently C. fruticans and selections close to the C. humile complex—valued for their bright yellow flowers and drought tolerance (Brickell, 1996). None are major timber or food crops, and invasive behaviour is not documented.

Threats are localized and habitat‑specific, with documented declines in certain Mediterranean and South African taxa (POWO, 2024). Comprehensive, phylogeny‑based revisions integrating chromosome data and fieldwork are still needed to resolve remaining synonymies and clarify conservation priorities.

Pick a Species to see its components: