Uebelmannia eriocactoides

Geographic & Climate

• Geographic Coordinates: Brazil, Minas Gerais, west of Diamantina, Serra do Espinhaço (approximately 18°14'S, 43°36'W)

• Climate Classification: Tropical wet-and-dry / Subtropical highland climate (Aw / Cwb)

• Habitat Characteristics: Elevations ranging from 700 to 1,100 meters above sea level. Inhabits arid to semi-arid steep slopes, ridges, horizontal crevices, and vertical quartzite rock faces within campo rupestre (dry savanna) formations, growing in pockets of organic leaf mold and sand. Subject to seasonal mist, high humidity, and high daytime solar radiation.

Botanical Morphology

• Diagnostic Features: Features a tall, upright, clavate to shortly columnar stem reaching 30–50 (up to 80) cm in height. The epidermis ranges from green to deep reddish-brown with a distinct white or bluish wax patina near the apex. Possesses 18 to 25 straight ribs. Unlike typical forms where areoles merge into a continuous line, the areoles here are individual, closely set, and densely covered with 11 to 20 fine, needle-like, golden-yellow to whitish-yellow spines (resembling juvenile Eriocactus leninghausii), measuring about 10 mm long. Older lower stems eventually become spineless. Flowers are diurnal, slender, funnel-shaped, and greenish-yellow, measuring about 15 mm long and 12 mm in diameter.

• Growth Habit: Solitary, slow-growing columnar habit. Active growth occurs from spring through summer, with sporadic flowering during this period. Requires high warmth, excellent mineral drainage, and winter protection with a strict minimum temperature of 10°C.

History & Etymology

• Etymology: The genus name Uebelmannia honors Werner Uebelmann, a Swiss Swiss cactus exporter and patron of botany. The specific epithet pectinifera derives from Latin pecten ('comb') and -fer ('-bearing'), referring to comb-like spine arrangements, while the varietal epithet eriocactoides combines the genus name Eriocactus with the Greek suffix -oides ('resembling'), referencing the striking similarity of its golden seedlings and spine clusters to juvenile Eriocactus (now Parodia) species.

• Historical Context: First described and studied within the complex taxonomic revisions of the genus Uebelmannia by botanists including R. Řepka, J. Krajča, and V. Toman (and later recombined by Guiggi), originating from the quartzitic outcrops of the Espinhaço range in Minas Gerais.