PlantaeDB Logo
Login Sign-up

Genus Echinopsis 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).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Echinopsis Zucc. belongs to Cactaceae and contains approximately 300 species of globular to columnar cacti native to South America, primarily distributed across Argentina, Bolivia, Chile, Paraguay, Peru, and Uruguay (Anderson & Date, 2019). The genus occurs in diverse Andean and lowland habitats from sea level to over 3,500 meters elevation, with centers of diversity in northwestern Argentina and southern Bolivia (Kiesling & Ferrari, 2005). The type species is E. eyriesii (Türschm.) Zucc.

The genus is distinguished by typically solitary, globose to short-columnar stems with prominent ribs and areoles bearing spines of variable length. Leaves are absent, as characteristic of cacti. Flowers arise from the stem apex or laterally on the upper half, producing large, nocturnal or diurnal, funnel-shaped blossoms with numerous tepals and prominent stamens. The inferior ovary develops into a fleshy, spiny fruit containing numerous small seeds with a hard testa (Anderson & Date, 2019).

Species diversity concentrates in the Andean highlands of northwestern Argentina and southern Bolivia, with secondary centers in Chile and Paraguay (Kiesling et al., 2014). Many species are locally endemic to specific mountain ranges or valley systems, often occurring on rocky outcrops, slopes, and shrublands. The genus occupies various biomes from coastal deserts to high-altitude grasslands, demonstrating remarkable ecological adaptation (Kiesling & Ferrari, 2005).

Pollination syndromes vary, with species producing nocturnal white or cream flowers primarily adapted for hawkmoths and crepuscular to diurnal colored flowers for bird or bee pollination (Schlumpberger, 2012). Fruit dispersal involves birds, mammals, and ants, with some species forming extensive clonal populations through vegetative offsets (Anderson & Date, 2019). Chromosome base number is well-established as n = 11, with polyploidy common in the genus (Kiesling et al., 2014).

Echinopsis has been divided into subgenera including Trichocereus (Berger) Backeb., with historical debate over taxonomic boundaries leading to recent synonymization of many former genera including Lobivia Britton & Rose and Trichocereus (A. Berger) Riccob. into Echinopsis (Schlumpberger & Date, 2023). Alternative treatments maintaining these genera are still referenced in some floristic works (Kiesling & Ferrari, 2005).

The genus provides important ornamental plants, with many species widely cultivated for their spectacular flowers, though wild collection for horticulture has historically impacted populations (Anderson & Date, 2019). Several species are considered weeds in agricultural areas where they can invade disturbed habitats. Conservation concerns center on habitat degradation and illegal collection, particularly for narrow endemics (Kiesling et al., 2014). Future research priorities include comprehensive phylogenetic analysis to resolve remaining taxonomic uncertainties and develop effective conservation strategies for threatened species (Schlumpberger & Date, 2023).

Pick a Species to see its components: