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x exsul   (Born.) Praeger, 1932

Par: Aeonium canariense   (L.) Webb & Berthel. × ?

Sempervivum ×exsul   Bornm., Sempervivum exsul  Bornm. (nov. spec.) . Sectio: Aeonium. In Fedde (ed.) Repertorium specierum novarum regni vegetabilis 13(347): 2-4. (20 Jul) 1913.

Aeonium ×exsul   (Bornm.) Praeger, An account of the Sempervivum group: 247. 1932.

Etym: From the Latin noun exsul, an exile.

T: Thought to have arisen in cultivation at the Royal Botanic Garden, Göttingen. There are no known herbarium specimens or illustrations.

Obs: Probably no longer extant. Both Bornmüller and Praeger speculated on the parentage, but did not agree. Praeger was quite convinced that he could see canariense in its makeup.

Praeger writes : " ....  a significant character of exsul is its leaf-margins sparingly and shortly pilose, not ciliate..... The short stem, very large rosettes, pilose leaf-margins, tall flowering shoot and elongate inflorescence, twice as long as broad, as well as the bright green soft leaves without midrib, and glandular-pubescent pedicels and calyx, .... taken together point very strongly to canariense influence. .... the pilose ciliation of canariense and its close allies is very persistent under hybridization.....What the other parent of exsul was cannot be determined : but as the flowers are whitish, greenish below, it was clearly a whitish-flowered plant, probably ciliatum or urbicum (An Account of the Sempervivum Group, p.247-248, 1932).


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