Definition

Noun: 1. A type of highly succulent, stemless, clump-forming plant with grey-green leaves. The leaves have a texture similar to lumps of granite. This plant is native to South Africa. 2. A type of cactus that is usually unbranched and spineless, covered with warty tubercles. It produces magenta flowers and white or green fruit. It resembles the related mescal plant and is native to northeastern Mexico and the southwestern United States.

Usage Notes

• "Living rock" is a common name used for two distinct, unrelated succulent plants that resemble stones or rocks. The specific plant being referred to is determined by its geographical and physical description.
• It functions as a singular noun but can refer to a single plant or a clump/group of these plants (e.g., "a living rock" or "a patch of living rock").

Examples

• Sense 1 (South African succulent):
  • The living rock is a master of camouflage in its arid homeland.
  • Botanists study the water-storing capabilities of the living rock.
• Sense 2 (North American cactus):
  • We found a living rock cactus blooming in the desert.
  • The living rock is sometimes mistaken for a pebble until it flowers.

Advanced Usage

• The term is often used in horticultural and botanical contexts to describe these specific species within the genera (for the South African plant) and (for the North American cactus).
• It exemplifies a morphological adaptation known as "stone mimicry" or "lithops," where a plant evolves to look like a rock to avoid herbivores.

Variants and Related Words

• Stone plant: A more general synonym, often used interchangeably with "living rock" for the South African succulent.
• Lithops: The scientific genus name for the South African "living rock" plants.
• Ariocarpus fissuratus: A primary scientific name for the North American "living rock" cactus.

Synonyms

• Sense 1: Stone plant, stoneface, pebble plant.
• Sense 2: Star rock, chautle.

Related Phrases

• Living stone: A direct synonym, especially for the South African succulent.
• Rock mimicry plant: A descriptive phrase explaining the plant's survival strategy.

Noun

1. highly succulent stemless clump-forming plants with grey-green leaves similar in texture to lumps of granite; South Africa
2. usually unbranched usually spineless cactus covered with warty tubercles and having magenta flowers and white or green fruit; resembles the related mescal; northeastern Mexico and southwestern United States