Cobweb House-leek vs Ermanian Houseleek

Sempervivum arachnoideum compared with Sempervivum ermanicum

Key Differences

• Cobweb House-leek is Not Evaluated while Ermanian Houseleek is Data Deficient.

Taxonomic Classification

Rank	Cobweb House-leek	Ermanian Houseleek
Kingdom same	Plantae (Plants)	Plantae (Plants)
Phylum same	Magnoliophyta (Flowering Plants)	Magnoliophyta (Flowering Plants)
Class same	Magnoliopsida (Dicots)	Magnoliopsida (Dicots)
Order same	Saxifragales (Saxifragales)	Saxifragales (Saxifragales)
Family same	Crassulaceae	Crassulaceae
Genus same	Sempervivum	Sempervivum
Species	Sempervivum arachnoideum	Sempervivum ermanicum

Evolutionary Relationship

Cobweb House-leek and Ermanian Houseleek share a common ancestor at the Genus level: Sempervivum.

Conservation Status

Cobweb House-leek

NE — Not Evaluated

Ermanian Houseleek

DD — Data Deficient

Physical Characteristics

Attribute	Cobweb House-leek	Ermanian Houseleek
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Cobweb House-leek

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Range

Found across Asia (Taiwan) and Europe (7 countries).

Ermanian Houseleek

Habitat

Typically found in diverse terrestrial habitats from tropical forests to temperate regions.

Cobweb House-leek

The cobweb house-leek (Sempervivum arachnoideum) is a distinctive succulent plant in the family Crassulaceae, immediately recognizable by the dense network of white, cobweb-like hairs connecting the tips of its rosette leaves—an adaptation that may protect the plant from intense ultraviolet radiation, desiccation, and grazing at high altitudes. Native to the mountain ranges of Europe, including the Alps, Apennines, Carpathians, and Pyrenees, this species colonizes exposed rocky outcrops, cliff faces, scree slopes, and thin soils from subalpine to alpine elevations, often growing in large mats. The rosettes are small, typically 1–3 centimeters in diameter, composed of densely packed, fleshy leaves colored green with reddish or purplish tips. Like all sempervivums, S. arachnoideum is monocarpic at the rosette level—individual rosettes flower once, producing a stalk bearing clusters of pink to magenta star-shaped flowers before dying, while the plant persists through the continuous production of offsets that form spreading clonal colonies. The specific epithet 'arachnoideum' derives from the Latin for spider, referencing the cobweb-like pubescence. This species has been widely cultivated in rock gardens and alpine gardens worldwide for its ornamental appeal and extreme hardiness. Several varieties and cultivars exist, showing variation in hair density and leaf coloration. Its conservation status has not been formally evaluated by the IUCN, though it remains common throughout its native range.