Eriosyce umadeave

Overview

Eriosyce umadeave is a highly specialized and rare cactus species belonging to the family Cactaceae, native to the high-altitude Andean regions of Argentina ¹. It is widely celebrated among collectors for its imposing, dense spines and neat globose habit.

Taxonomy and naming

Originally described as Echinocactus umadeave, it was later combined into Pyrrhocactus before genetic and morphological studies placed it within the broadly defined genus Eriosyce ². The specific epithet "umadeave" stems from indigenous words referring to its distinct look, often associated with a "bird's nest" due to its incurved spines.

Distribution and habitat

This species is endemic to northwestern Argentina, specifically in the provinces of Salta and Jujuy, growing at extreme elevations between 2,000 and 3,500 meters above sea level ¹. Its habitat consists of dry, windy, sun-drenched rocky slopes characterized by subalpine conditions and freezing winter temperatures.

Appearance

It is a solitary, globose to short-cylindrical cactus reaching up to 30-40 cm in height. Its most striking feature is the dense cage of thick, upwardly curved, waxy yellow-to-grey spines that completely shroud the stem ². In mid-summer, it produces bell-shaped, pale yellow to greenish flowers from the woolly crown.

Cultivation and care

In cultivation, Eriosyce umadeave is notoriously difficult to grow ³. It demands intense, direct sunlight and superior air circulation to mimic its alpine home. The growing medium must be purely mineral (pumice, perlite, granite grit) with virtually no organic matter. When kept completely dry in winter, it can easily tolerate severe frost down to -12°C.

Common mistakes

Overwatering is the leading cause of loss. Even slightly damp soil during cool periods can trigger rapid root rot. Using standard organic potting soil or placing it in stagnant, humid indoor air will quickly prove fatal.