Uebelmannia

Rare form with golden-yellow spines resembling those of Eriocactus, contrasting sharply with black-spined varieties. It grows on quartz outcrops in Brazil (Minas Gerais), between 700–1,100 m, among rocks.

This is the Uebelmannia population found at the highest-elevation locality of the genus (1415 m), thriving in rocky highland environments with slightly cooler conditions than typical for the species.

The southernmost known population of Uebelmannia grows at an elevation of 1220 m, thriving in rocky highland environments with slightly cooler conditions than typical for the species.

The horrida variety is greener than the type, with firm lizard-skin-like texture and more spreading spines (lacking the comb effect). Color adapts to light: green in shade, purple in full sun.

Solitary globular cactus with stems shifting from green to purple, topped by a woolly apex. Areoles are so densely packed they appear as near-continuous felt-like lines along the ribs. Honey-yellow, amber, or orange-brown spines.

A geometric wonder with leathery green to bronze reptilian skin. Its woolly gray crown offsets amber-reddish juvenile spines that mature to graphite, all comb-aligned with mathematical precision. Nature's sculpture at its most symmetrical.

The var. multicostata represents a local form of Uebelmannia pectinifera distinguished by its higher rib count. While typical U. pectinifera develops 15-18 ribs, this variety consistently produces 20 or more.

Questa varietà si distingue per il maggior numero di costolature (20 o più), contro le 15-18 della forma tipica. As the plant matures, it takes on a greyish-purple coloration. Absolutely stunning!