Living Sculpture: Myrtillocactus geometrizans f. cristata 'Variegata' (Keithii)

An exceptionally rare mutant cultivar, this crested and variegated specimen offers a mesmerizing, fan-like architecture splashed with golden hues, making it a crown jewel for connoisseurs.

1. Origin & History of Name: The genus Myrtillocactus combines the Latin myrtillus (bilberry) with cactus, referencing the plant's small, blueberry-like fruit. The species epithet geometrizans honors the mathematically precise, architectural rib structure described by botanist Carl Martius in 1837. The label 'Keithii' denotes this specific clone, likely named after the collector or nurseryman who isolated this stable variegated lineage.
2. Morphology: This specimen exhibits fasciation, a mutation where the apical meristem elongates into a linear crest rather than a single point, creating undulating, coral-like folds. The epidermis features a striking contrast between the species' natural glaucous blue-green and sectorial yellow variegation (chlorophyll-free zones), all protected by sparse, short black spines.
3. Habitat & Origin: While the standard Myrtillocactus geometrizans is native to the semi-arid shrublands of Central Mexico, this variegated crest is a 100% nursery-produced cultivar. It does not exist in the wild and is propagated sustainably via vegetative cuttings or grafting to preserve its unique genetic code.
4. Cultivation Profile:
   • Substrate: Use a highly porous, mineral-heavy mix (70% pumice/cinder/perlite, 30% cactus soil) to ensure rapid drainage, which is critical in Indian humidity.
   • Light: Requires bright, filtered light. Unlike the green form, the sensitive yellow variegated tissue will scorch under the harsh direct Indian afternoon sun (12 PM–4 PM).
   • Water/Dormancy: Water deeply but infrequently, allowing the pot to dry completely between cycles. Suspend watering during the monsoon (to prevent fungal issues) and winter dormancy (Dec–Feb).
5. Scientific/Historical Anecdote: In its native Mexico, the standard species is locally known as "Garambullo" and is historically valued for its sweet, edible berries rather than its appearance. The "crested" form is a biological accident that typically perishes in the wild; it survives today only because human collectors have preserved its bizarre, sculptural beauty for centuries.