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Genus Tara in Subfamily Caesalpinioideae

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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Tara (authority: Molina) is a Neotropical genus in subfamily Caesalpinioideae (Fabaceae) comprising about nine species of shrubs and small trees. Its distribution extends from Mexico through Central America and the Caribbean to northern South America, with centers of diversity in the dry forest corridor of the Pacific slope and in the Venezuelan Andes. Tara spinosa, historically known as Caesalpinia spinosa, is the type of the genus.

Tara typically bears evergreen or subevergreen foliage with opposite to subopposite, bipinnate leaves whose rachises are often armed with stipular spines; leaflet number and size vary but leaflets are usually small, entire, and leathery with an often rusty indumentum. Inflorescences are axillary or terminal racemes or panicles; flowers are zygomorphic, pentamerous, with a prominent banner, laterally positioned wings, and a shorter, basally pouch-like keel. Nectaries are usually borne on the hypanthium. The ovary is superior with axile placentation and 1–5 ovules; fruits are compressed, dehiscent pods (sometimes winged), and seeds are flattened and often dark. The species are largely diagnosable by features of armature, leaflet size and vestiture, flower size and color, and pod shape and dehiscence.

Tara is most diverse in seasonally dry tropical forests and scrub from lowland coastal habitats to montane slopes up to about 1500 m. Biogeographically it participates in the Mesoamerican–Chocó and northern Andean dry forest networks; several species are narrowly endemic to specific cordilleras or islands. The common T. spinosa is widely naturalized beyond its native range, especially in anthropogenic sites.

Pollination is presumed to be by bees typical of caesalpinioid legumes (e.g., Xylocopa, Centris), and seed dispersal appears to be ballistic and hydrochorous in several species. The base chromosome number is x = 12, which is common in the tribe Caesalpinieae.

Taxonomically, Tara is treated as distinct within the “Caesalpinia group” in recent phylogenies, and species traditionally assigned to Caesalpinia s.l. have been redistributed into segregate genera, including Tara (Gagnon et al., 2016; Lewis et al., 2005). Species limits have been clarified for the widespread T. spinosa and its close allies, while narrower endemics remain under study. Some authors retain Caesalpinia spinosa as accepted in the broad sense, creating synonymy with Tara (Nesom, 2016), reflecting continued debate on generic limits.

T. spinosa is cultivated for seed-derived tannin and hydrocolloid (“tara gum”) and is valued ornamentally in dry landscapes; the dense spines and feathery foliage provide hedging and erosion control, while the nectar-rich flowers support pollinators. Other species are used locally for timber and fence posts. T. spinosa can be invasive in disturbed sites, with a capacity for rapid spread where introduced.

Conservation data are uneven; several species with restricted distributions likely face habitat loss, whereas the most common taxa are secure. Further research on species-level diversity and population status across range countries would sharpen conservation planning.

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