PlantaeDB Logo
Login Sign-up

Genus Crescentia in Family Bignoniaceae

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!

Crescentia L. (family Bignoniaceae) comprises about five to seven species of small to medium trees native to lowland tropical America, with a concentration in Central America and the northern Andes. The type species, Crescentia cujete L., is widely cultivated for its large, gourd‑like fruit (POWO, 2024; WFO, 2024). The genus is diagnosed by evergreen trees bearing simple, alternate leaves that are usually clustered near branch ends, entire margins, and often glabrous surfaces; minute stipules may be present but are usually early caducous. Cauliflorous inflorescences produce solitary or few‑flowered clusters on older wood; the corollas are campanulate, five‑lobed, and fused at the base, with didynamous stamens attached to the corolla tube. The ovary is superior, bilocular with axile placentation, each locule containing two ovules. The fruit is a large, indehiscent, fleshy pepo with a hard outer shell; seeds are embedded in a sweet pulp.

Species richness is concentrated in the Caribbean basin and the Amazonian region, where several narrow endemics occur. C. cujete has become naturalised throughout the tropics following human cultivation, while C. amazonica is restricted to western Amazonian floodplain forests. The genus inhabits lowland moist forests, secondary growth, and coastal thickets, generally below 800 m elevation, and shows a disjunct pattern between mainland and island populations.

Intrinsic biology remains insufficiently documented, but observations suggest that the nocturnal, pale flowers attract bats, and fruit removal is primarily by frugivorous birds and mammals, with the buoyant fruit enabling hydrochorous dispersal. Chromosome counts are consistently 2n = 42 for cultivated C. cujete, indicating a base number x = 21 (García et al., 2018).

Taxonomically, Crescentia is monophyletic within tribe Crescentieae, a position supported by recent nuclear and plastid phylogenies (Olmstead et al., 2015; Siniscalchi & Luebert, 2021). No formally recognised subgenera are currently accepted, although historical treatments (e.g., Sprague, 1923) proposed a subdivision based on fruit morphology, a treatment not retained in contemporary floras.

Humans exploit C. cujete for its durable fruit shells, used as water containers, kitchen utensils, and musical instruments; several species are planted as ornamentals, and some have become naturalised weeds in agricultural landscapes. Conservation concerns focus on habitat loss for narrow endemics and over‑harvesting of wild populations, but cultivated individuals provide an ex‑situ safety net. Continued field surveys and genetic monitoring are required to safeguard the genus under projected climate change (POWO, 2024).

Pick a Species to see its components: