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Genus Manihot in Family Euphorbiaceae

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).

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Genus Description

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Manihot belongs to Euphorbiaceae and comprises approximately 99 accepted species (POWO, 2024), distributed from Mexico to northern Argentina, with a major center of diversity in the Brazilian Cerrado and related seasonally dry biomes; Manihot esculenta Crantz (cassava) serves as the standard type species (POWO, 2024). Plants are typically shrubs or small trees with milky latex; leaves are alternate, usually palmately lobed to parted (sometimes deeply so), with caducous or persistent stipules. Inflorescences are thyrses, racemes or panicles; flowers are unisexual, the staminate flowers with 5–10 free stamens and no disk, the pistillate with a 3-locular ovary and axile placentation. The fruit is a 3-lobed capsule; seeds possess a conspicuous caruncle and a membranous aril (Webster, 1994; Keay, 1958).

Diversity concentrates in the Neotropics, especially in the campos rupestres and cerrados of Brazil, with additional species in the seasonally dry forests and chaco woodlands of Mexico, Central America and the Southern Cone; narrow endemics occur on limestone outcrops and in gallery forests (Rogers and Appan, 1973). Typical habitats are low to mid-elevation, seasonally drought-prone, and fire-influenced landscapes.

Pollination is generalized and largely entomophilous, with unspecialized flowers and conspicuous nectar guides; primary fruit dispersal is ballistic, with seeds dispersed short distances by dehiscent capsules, while secondary dispersal by ants attracted to the caruncle is common (Rogers and Appan, 1973). A base chromosome number of x = 18 is widely reported (Goldblatt and Johnson, 1979–2003), and polyploidy occurs within cultivated cassava (Särkinen et al., 2013).

Manihot is monophyletic within the “ALE” clade of Euphorbiaceae (Wurdack et al., 2005; van Ee et al., 2022), and most species are readily recognized by their milky latex and palmately lobed leaves. Infrageneric classification varies; historical sectional or subgeneric treatments (Rogers and Appan, 1973; Müll.Arg.) are not consistently supported by recent phylogenetic data, and generic boundaries are stable despite ongoing species-level revisions (Chacón et al., 2014; Särkinen et al., 2013; Miller and Hipp, 2007).

Manihot esculenta is a major global staple crop, with local sweet and bitter cultivars; several species (e.g., M. aesculifolia, M. grahamii) are cultivated as ornamentals, while certain perennial taxa occasionally naturalize and behave as environmental weeds (Weber et al., 2008). Habitat loss in the Cerrado and lack of systematic conservation attention pose the main threats; the outlook depends on targeted ex situ conservation and coordinated research on taxa delimitation (Rogers and Appan, 1973; Wurdack et al., 2005).

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