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Genus Datura in Tribe Datureae

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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Within the family Solanaceae, Datura L. comprises roughly 15 species of erect herbs and short‑lived shrubs native to the warm temperate and subtropical Americas but now naturalised throughout tropical Old World regions (POWO, 2024; WFO, 2024). The type species is Datura stramonium L., the classic Jimson weed, which anchors the generic name (Olmstead & Bohs, 2007). The plants bear large, alternate, ovate leaves that are glandular‑pubescent when young and lack true stipules; stems may be herbaceous or become woody at the base, and the foliage releases a strong odor when crushed (Yuan et al., 2018). Solitary, terminal or axillary flowers have funnel‑shaped corollas up to 20 cm long, usually white to pale violet, with five deep lobes that serve as landing platforms for hawkmoth pollinators (Barbour & Gentry, 2015). The superior ovary is typically bilocular, each locule containing many ovules on axile placentae, and the fruit is a spiny, four‑valved capsule that dehisces explosively, releasing numerous flattened black seeds (Yuan et al., 2018).

Species richness peaks in Mexico and the Andean foothills, where several narrow endemics such as Datura kymatocarpa occur, while lowland disturbances across the Americas, Africa and Asia support the weedy D. stramonium and Datura metel, which colonise disturbed soils from sea level to about 2 000 m (POWO, 2024). The genus thus illustrates a New World origin with multiple anthropogenic introductions to the Old World (WFO, 2024).

Pollination is dominated by Sphingidae moths attracted to nocturnal scent and the large floral tube, although occasional bee visitation is recorded (Barbour & Gentry, 2015). Seed dispersal occurs primarily by wind and gravity from the spiny capsules, with mammals and birds also aiding transport (Yuan et al., 2018).

Molecular phylogenetics consistently places Datura as a monophyletic group sister to Brugmansia, and recent classifications recognise two subgenera: Datura (including D. stramonium and D. inoxia) and Metel (including D. metel and D. quercifolia) (Olmstead & Bohs, 2007; Yuan et al., 2018). Some authors have proposed merging Brugmansia into Datura, a view not universally accepted (Barbour & Gentry, 2015).

The genus is cultivated for its ornamental trumpet‑shaped flowers and serves as a model organism in genetics; D. stramonium remains a troublesome agricultural weed in many regions (POWO, 2024). Several narrow endemic taxa are threatened by habitat loss, and climate change poses a risk to high‑elevation populations; targeted field surveys and ex situ conservation are priorities for future research (POWO, 2024).

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