Uebelmannia pectinifera

Geographic & Climate

• Geographic Coordinates: 18°15'S to 18°30'S, 43°30'W to 43°45'W (Serra do Espinhaço, Minas Gerais, Brazil)

• Climate Classification: Tropical Savanna Climate (Köppen: Aw) / Subtropical Highland Climate (Cwb)

• Habitat Characteristics: Endemic to high-altitude rocky plateaus (campo rupestre) at elevations of 650–1,350 meters. Grows in acidic, nutrient-poor soils composed of quartzitic gravel, sand, and organic humus, subjected to high solar radiation, frequent night fogs, and seasonal precipitation.

Botanical Morphology

• Diagnostic Features: Solitary, globose to dynamic elongated cylindrical stem (up to 100 cm tall, 10–15 cm in diameter) featuring a dark reddish-brown, purplish, or dark green epidermis covered with a granular, waxy white bloom. It typically possesses 15–18 prominent, sharp, vertical ribs. Areoles are closely set and confluent along the rib crests, producing dense, comb-like (pectinate) dark brown to black central spines (up to 1.5–2.5 cm long) aligned in a continuous ridge. Flowers are small, diurnal, funnelform, greenish-yellow (15–20 mm long, 12–15 mm wide), emerging near the apex.

• Growth Habit: Very slow-growing species. Enters winter dormancy under cooler temperatures. Reaches a mature height of up to 100 cm and a diameter of 10–15 cm in natural habitats.

History & Etymology

• Etymology: The generic name Uebelmannia honors Werner Uebelmann (1921–2014), a Swiss cactus importer and collector who financed botanical expeditions to South America. The specific epithet pectinifera derives from Latin pecten (comb) and -fer (bearing), translating to "comb-bearing," directly referring to the arrangement of spines along the ribs.

• Historical Context: Discovered in 1966 by the Dutch botanist Albert Frederik Hendrik Buining and professional collector Leopoldo Horst in Minas Gerais, Brazil. The species was formally described by Buining in 1967 in the journal National Cactus and Succulent Journal. Its unique, sculpture-like appearance caused a major sensation in the worldwide succulent community during the late 20th century, leading to historical over-exploitation that rendered it an endangered species in its native range.