ACANTHOCALYCIUM

Autor: Backeberg & Knuth • ETYMOLOGY “Spiny calyx”, referring to the main morphological characteristic of the genus. • DESCRIPTION A genus of usually single-stemmed plants, globose to lightly elongated, with the apex depressed. Ribs acute, more or less tuberculate, spines usually straight, aciculate to subulate. Flowers diurnal, subapical (main difference with Echinopsis sensu lato), funnel-shaped to…