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Sempervivum arachnoideum
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Order:	Saxifragales
Family:	Crassulaceae
Genus:	Sempervivum
Species:	S. arachnoideum
Binomial name
Sempervivum arachnoideum L.

Sempervivum arachnoideum, the cobweb house-leek, is a species of flowering plant in the family Crassulaceae, native to European mountains, in the Alps, Apennines and Carpathians. Growing to 8 cm (3 in) tall by 30 cm (12 in) wide, it is a rosette-forming succulent perennial, valued in cultivation for its ability to colonise hot, dry areas via offsets.

The specific epithet arachnoideum refers to its furry central rosettes (long ciliate leaf margins), resembling spider webs.

It flowers in July, with pink flowers that are raised on stems and are hermaphroditic (having both male and female organs).

This plant, and the subspecies Sempervivum arachnoideum subsp. tomentosum, have gained the Royal Horticultural Society's Award of Garden Merit.

References

1. BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
2. RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 978-1405332965.
3. Harrison, Lorraine (2012). RHS Latin for gardeners. United Kingdom: Mitchell Beazley. p. 224. ISBN 9781845337315.
4. "RHS Plant Selector - Sempervivum arachnoideum". Retrieved 5 March 2021.
5. "RHS Plantfinder - Sempervivum arachnoideum subsp. tomentosum". Retrieved 9 November 2018.
6. "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 96. Retrieved 9 November 2018.

• S. arachnoideum flower
• Another flower
• Characteristic "spider web" on rosettes

• Sempervivum
• Plants described in 1753
• Taxa named by Carl Linnaeus