PlantaeDB Logo
Login Sign-up

Genus Celastrus in Family Celastraceae

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!

Celastrus is a genus in the family Celastraceae (APG IV, 2016). About 100 species are currently accepted (POWO, 2024; WFO, 2024), ranging from woody lianas to erect shrubs. The genus occurs from temperate to tropical zones across eastern Asia, the Himalayas, and eastern North America, with diversity centers in China and Japan. The type species is Celastrus scandens L., the North American bittersweet.

Members of Celastrus have alternate, simple, deciduous leaves, often with minute stipules or none. The bark develops conspicuous lenticels. Inflorescences are axillary or terminal panicles of small, actinomorphic, five‑merous flowers; each flower has five sepals, five petals, five stamens opposite the petals, and a superior ovary with three to five locules. The style is simple or slightly lobed; the fruit is a three‑lobed, loculicidal capsule that opens to reveal arillate seeds.

Diversity is highest in East Asia, where roughly 70–80 species occur, while the North American flora includes about a dozen taxa. Many endemics inhabit montane forests, river margins and coastal dunes, ranging from sea level to over 3000 m. The genus shows a strong continental disjunction between Asian and American lineages.

Pollination is primarily by insects, especially bees and flies, while the conspicuous aril facilitates bird‑mediated seed dispersal. Cytogenetic data consistently indicate a base chromosome number of x = 13, with diploid 2n = 26 and tetraploid 2n = 52 reported across the range (Zhang et al., 2019). Most species are deciduous lianas twining clockwise around host supports; occasional erect shrubs occur.

In recent systematic treatments, Celastrus is monophyletic within Celastraceae and divided into two major clades roughly following geographic distribution. Ding et al. (2015) recognised the subgeneric names Celastrus and Osiandra for the Asian and American lineages, respectively. Alternative circumscriptions merging Celastrus with Euonymus have been proposed, but molecular evidence supports maintaining a distinct genus (APG IV, 2016; Zhang et al., 2019).

Several species are cultivated as ornamental climbers, most notably Celastrus orbiculatus for its vivid autumn foliage. The same species has become invasive in parts of North America, where vigorous growth and bird‑dispersed seeds threaten native flora. The genus provides no major timber or food crops.

Conservation concerns include habitat loss for narrow‑endemic Asian taxa, while the invasive potential of introduced lianas remains a research focus.

Pick a Species to see its components: