PlantaeDB Logo
Login Sign-up

Genus Melochia in Family Malvaceae

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!

Melochia (L.) belongs to the family Malvaceae, subfamily Byttnerioideae, and is an emblematic component of tropical open and disturbed habitats worldwide (APG IV, 2016). The genus contains approximately 75 species with broad pantropical distribution, occurring in the Americas, sub-Saharan Africa, and South and Southeast Asia to Australasia, commonly in grasslands, savannas, forest margins, roadsides, and secondary vegetation from near sea level to mid-elevations (POWO, 2024; WFO, 2024). The type species is Melochia corchorifolia L.

Plants are erect herbs, shrubs, or small trees bearing simple, usually distichous leaves that are often densely covered with stellate or dendritic indumentum and possess conspicuous stipules. Inflorescences are terminal or axillary, frequently compact, cymose or thyrsoid, and sometimes glomerulate; individual flowers are small with five free to slightly basally fused petals, a five-lobed calyx, five stamens, and a superior five-carpellary ovary whose style typically branches into five parts. Fruit is a schizocarp separating into five mericarps, each usually with a thin pericarp and often a rounded to slightly beaked apex (Gonçalves, 2004).

Species richness centers in the Neotropics, with numerous taxa in Brazil and the Caribbean, and additional diversity in tropical Africa and the Indo–Pacific (Gonçalves, 2004; GBIF, 2024). Many species are local endemics within island or continental ranges and often occupy open, fire- or disturbance-prone habitats.

Pollination and dispersal are only sporadically documented; small, nectariferous flowers suggest generalized insect visitation, while mericarps likely facilitate local autochory or epizoochory; precise mechanisms remain poorly resolved (Nyffeler & Baum, 2000). Chromosome counts, such as 2n = 56 for Melochia corchorifolia, have been recorded, but base numbers for the genus are not yet well established in the literature (Rossignol et al., 1978).

Melochia is often placed in tribe Hermannieae alongside Waltheria, with phylogenetic studies nesting Melochia firmly within Byttnerioideae and supporting a monophyletic core (Nyffeler & Baum, 2000; Whitlock et al., 2001; Triana–Plaza et al., 2017). Some species long accommodated in Riedelia are widely merged into Melochia following recent revisions and phylogenies, although alternative treatments retaining Riedelia for certain elements persist (Gonçalves, 2004). Sterculiaceae sensu lato has been abandoned, and modern classifications place Melochia in the expanded Malvaceae (APG IV, 2016).

Human relevance is limited; a few species are weedy or occasionally cultivated as ornamental foliage plants, and one Neotropical taxon, Melochia concatenata, has become naturalized outside its native range. No medicinal claims are supported here.

Habitat conversion and fragmentation threaten narrow endemics, especially on islands and in savannas with fire pressure; discovery and taxonomic resolution of undescribed taxa continue apace (POWO, 2024; WFO, 2024).

Pick a Species to see its components: