Eulychnia is a genus of columnar, candelabriform cacti in the family Cactaceae (order Caryophyllales), first described by the German-Chilean botanist Rodulfo Amando Philippi in his 1860 flora of the Atacama region, Florula Atacamensis. The genus comprises around six to nine species, all native to the coastal deserts of southern Peru and northern and central Chile.
Plants are shrubs or trees, typically with a distinct trunk and abundant ascending branches that form a candelabra-like silhouette — the form that gave the genus its name. Stems carry 8 to 17 prominent ribs lined with areoles bearing wool, long hairs, and robust spines. The medium-sized flowers appear near the stem tips and open continuously; they are bell- to funnel-shaped and range in colour from white to pale pink, with the pericarp and short floral tube covered in woolly hairs or bristly spines and numerous scales. Fruits are globose, fleshy, and scaly or hairy; seeds are broadly ovoid with a matte black or grey, finely warty surface.
Eulychnia species are extreme xerophytes, tolerating temperatures up to 50 °C and growing in some of the driest terrain on Earth, including the Atacama Desert. Within their range along the western Andean foothills — generally below 1000 m elevation — they are heavily influenced by coastal fog (camanchaca) and often form dense, dominant stands in the landscape. Individuals are believed to be very long-lived.
Etymology
The genus name Eulychnia derives from the Greek for "fine lamp" or "beautiful candlestick," a reference to the tall, columnar stems that branch into an upright candelabra-like form. The genus was described by Rodulfo Amando Philippi in 1860.
Distribution
Eulychnia is native to the coastal deserts of southern Peru and northern and central Chile. Species grow primarily along the western coastal mountain range at elevations generally below 1000 m, in habitats strongly shaped by Pacific coastal fog. Several species are characteristic of the Atacama Desert, one of the driest regions on Earth.
Taxonomy
Eulychnia Phil. was established in Philippi's 1860 Florula Atacamensis seu Enumeratio (p. 23). It is placed in the family Cactaceae, order Caryophyllales, and the GBIF backbone recognises it as an accepted genus. Plants of the World Online (as of January 2026) accepts approximately nine species; GBIF records six accepted descendants.
