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Genus Myrtillocactus in Family Cactaceae

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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Myrtillocactus is a small, tree-like cactus placed in tribe Trichocereeae of the family Cactaceae. The genus is treated as monotypic with Myrtillocactus geometrizans Console as the type (Britton & Rose, 1920). It occurs widely in the Balsas Basin and adjacent arid and thorn-scrub zones of southern to central Mexico, extending into Oaxaca and Puebla, where it grows on limestone hills and rocky slopes at approximately 700–1900 m (Hernández et al., 2004). The plants develop columnar, blue‑glaucous stems with 5–8 deep ribs, prominent areoles, and one long central spine flanked by shorter radials. Flowers are nocturnal, funnel‑shaped, greenish to creamy, and often produced in crowns on younger stem tips; the ovary is inferior with numerous ovules and the fruit is a globose, purple to deep magenta berry with numerous minute seeds (Barthlott & Hunt, 1993).

The species is a conspicuous element of tropical deciduous forest edge and xerophytic shrubland and shows centers of diversity in the Balsas Depression and the Tehuacán–Cuicatlán region (Villaseñor, 2016). Flowers open at night and appear adapted to moths or small bats; fruits are dispersed by birds and mammals that consume the ripe berries (Hernández et al., 2004). Chromosome numbers of 2n=22 have been reported (Posada et al., 1999).

Taxonomically, Myrtillocactus has not been split into formal subgenera or sections in recent treatments and is widely recognized as monotypic (Hunt et al., 2006; Anderson & Kirk, 2009). Earlier classifications that combined it with related columnar cacti have been superseded; alternative generic concepts placing some taxa in other genera, such as those accepted in some Mexican checklists, are treated as synonyms of M. geometrizans in current surveys (Villaseñor, 2016). Molecular studies place the genus within the Trichocereeae clade (Barrett et al., 2019).

Human relevance is largely horticultural and ethnobotanical: the species is occasionally cultivated as an ornamental and hedgerow plant, and its fruits (commonly called “garambullo”) are gathered for local consumption and jams (Hernández et al., 2004). It is not widely considered an agricultural weed. While not assessed globally, local populations face pressure from land‑use change and harvesting, underscoring the need for distribution and demographic data (Barrett et al., 2019).

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