A Grammatical Dictionary of Botanical Latin

Tectorum: 'of roofs' gen.pl. of tectum,-i (s.n.II), q.v., roof, as of houses;

- plantae tectorum, plants of roofs, especially thatched ones.

- Меnse Decembri, non solum in agris, sed etiam in urbanis hortis ad putrida ligna, necnon in tectorum tabulis, & ostiis ligneis (Mich.), in the month of December, not only in fields but also in urban gardens on rotted wood, and also on the boards of roofs and wooden doors.

Bromus tectorum, a Brome-grass, “of roofs, from its growing in thatch” (Fernald 1950); Sempervivum tectorum, the House-leek “which grows freely on stone and slate roofs .... Various plants growing on thatched roofs in Sweden were named ‘tectorum’ by Linnaeus” (Stearn 1996).

Sempervivum,-i (s.n.II) House-leek > L. semper, always + vivus, alive, living. Houseleek, S. tectorum (of roofs), was regarded as effective against lightning and for that reason this fleshy herb was planted on roofs. Crassulaceae” (Stearn 1996).