garden.org
The National Gardening Association
https://garden.org › plants › view › 680086 › Common-Houseleek-Sempervivum-tectorum-subsp-alpinum-Griseb-Schenk-Wettst
garden.org
The National Gardening Association
https://garden.org › plants › view › 680086 › Common-Houseleek-Sempervivum-tectorum-subsp-alpinum-Griseb-Schenk-Wettst
powo.science.kew.org
Plants of the World Online
https://powo.science.kew.org › taxon › urn:lsid:ipni.org:names:77225061-1
rhs.org.uk
en.wikipedia.org
llifle.com
gardenia.net
missouribotanicalgarden.org
encyclopaedia.alpinegardensociety.net
Alpine Garden Society
encyclopaedia.alpinegardensociety.net › plants › Sempervivum › tectorum
rhs.org.uk
worldfloraonline.org
World Flora Online
https://www.worldfloraonline.org › taxon › wfo-0000441750
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