Aucamp's Living Stone (Lithops aucampiae) is a masterfully camouflaged succulent in the family Aizoaceae, virtually indistinguishable from the ironstone pebbles among which it grows in the Northern Cape of South Africa. Each plant consists of a single pair of thick, fused leaves forming a plump, kidney-shaped body split by a central fissure — a botanical disguise so perfect that the plant was not described by science until 1929.
• Named in honor of J. Aucamp, a South African farmer who first collected the species near Postmasburg in the Northern Cape
• One of approximately 37 species in the genus Lithops, all endemic to southern Africa and all masterful stone mimics
• The species is one of the largest in the genus, with individual bodies reaching up to 5 cm across
• Exhibits a remarkable range of color morphs within populations, each precisely matching local stone colors
• Like all Lithops, each "stone" is actually a single pair of succulent leaves that have evolved over millennia to replicate surrounding rocks
Taxonomie
• Found in a relatively restricted area around Postmasburg, approximately 250 km southwest of Kimberley
• Occurs at elevations of approximately 1,200 to 1,400 meters
• Grows almost exclusively on ironstone gravel flats and rocky ridges in arid savanna and grassland transition zones
• The species inhabits areas receiving approximately 300 to 400 mm of annual rainfall, predominantly in late summer
• The ironstone gravel plains are characterized by dark reddish-brown to blackish stones, which the plant's body coloration precisely mimics
• First described by the South African botanist Nicholas Edward Brown in 1929
• Shares its habitat with other succulent specialists including species of Conophytum, Euphorbia, and Stapelia
• Populations are threatened by illegal collection and habitat degradation from diamond and iron ore mining activities
Body:
• Each body consists of a single pair of opposite, thick, fleshy leaves fused into a truncate-conical to kidney-shaped form
• Individual bodies typically 2 to 5 cm tall and 2.5 to 5 cm wide — among the largest in the genus
• Upper surface (face): flat to slightly convex, variously patterned in shades of reddish-brown, dark brown, grayish-brown, or iron-rust colors
• Patterns include irregular islands, channels, and rubrications (dotted markings) in darker or lighter hues
• A deep fissure bisects the body, from which the new leaf pair and flower emerge
• Body coloration precisely mimics the surrounding ironstone gravel
Flowers:
• Large relative to the plant body, 3 to 5 cm in diameter
• Bright golden-yellow, sometimes with a white center
• Daisy-like with numerous narrow petals
• Emerging from the central fissure, typically in autumn (March to May in the southern hemisphere)
• Open in late afternoon and close at dusk; sweetly fragrant
Roots:
• A long, stout taproot that anchors the plant firmly in rocky ground and stores moisture
Fruit:
• Woody, multi-chambered capsules that open only when wetted by rain (hygrochastic), releasing seeds over many years
• Seeds extremely small, less than 1 mm in diameter
Soil:
• Requires an extremely gritty, well-drained mix — a blend of coarse sand, fine gravel, and a small amount of loam or pumice
• Avoid organic-rich soils; a mineral-based substrate is essential
• Top dress with matching gravel to stabilize plants and mimic natural camouflage
Watering:
• The most critical and challenging aspect of Lithops care
• Water ONLY during the autumn growing season, when new leaves are developing and flowering
• Keep completely dry during winter (old leaves shrinking), spring (new body emerging), and summer dormancy
• A single overwatering episode can kill the plant within days
• When in doubt, do not water
Light:
• Requires bright light with some direct sun; at least 4 to 5 hours of direct morning sun is ideal
• Insufficient light causes the body to stretch and become soft and pale
Temperature:
• Prefers warm days (25 to 35°C) and cool nights (10 to 15°C) during the growing season
• Can tolerate temperatures down to approximately 0°C if kept bone dry
• Good ventilation is essential to prevent fungal rot
Transplanting:
• Plant deeply enough that only the flat upper face is visible above the soil, with the taproot extending straight down
Wusstest du schon?
Lithops aucampiae is so perfectly camouflaged that botanists searching for the plant in habitat often find them only when they are in flower — the bright yellow blooms suddenly appearing among the stones like tiny golden stars, betraying the presence of plants that were invisible just days before.
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