Echinopsis candicans
Echinopsis candicans is a species of cactus from northern and western Argentina (Monte Desert). It has large fragrant white flowers that open at night. Description. "Echinopsis candicans" has a shrubby growth habit, with individual stems up to tall. The plant as a whole can be as much as across. The stems are light green, with a diameter of up to and have 9–11 low ribs. The large white areoles are spaced at and produce brownish yellow spines, the central spines being up to long, the radial spines only up to . The fragrant white flowers open at night. They  are large, up to across and long. Taxonomy. The species was first described in print by Joseph zu Salm-Reifferscheidt-Dyck in 1834 in his work "Hortus Dyckensis", where he attributed the name "Cereus candicans" to Gillies. In 1920, Britton and Rose placed the species in "Trichocereus". In a 1987 publication, David Hunt transferred the species to the genus "Echinopsis", attributing this placement to Frédéric Weber. The broad circumscription of "Echinopsis" remains controversial; the genus is accepted not to be monophyletic.