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SURCULOSUM Cosson, 1873

Synonym : Sempervivum surculosum  (Cosson) Kuntze (1891)


Distribution : Morocco; 2400 - 3800 m.



Description (according to IHSP, 2003) :


Sparsely glandular-pubescent rosulate perennial herbs with a short thick monopodial stem (or caudex) and numerous short axillary stolons with small rooting terminal rosettes.


Leaves alternate, obovate to obovate-oblong or spatulate, semipetiolate or sessile, obtuse or rounded, to 20 mm.


Inflorescences : Flowering branches axillary, ascending, to 5 cm long, inflorescences lax few-flowered cymes, pedicels filiform, to 22 mm.


FIowers 5- to 7-merous, sepals broadly sessile, basally connate, ovate, obtuse, ± 2 mm, petals ovate-oblong, obtuse, yellow, ± 3,5 x 2 mm, anthers yellow or red.


S. surculosum is closely related to S. jaccardianum. Mes & 't Hart (1994) proposed that S. surculosum var. luteum (2n = 32) could have evolved from diploid S. jaccardianum (2n = 16) through polyploidy, and that S. surculosum var. surculosum (2n = 30) in turn resulted from var. luteum through a descending dysploid change. S. surculosum, S. jaccardianum and S. modestum have been classified in Ser. Monanthoidea, which is the sister-group of the "Macaronesian Sempervivoideae", i.e. Aeonium, Aichryson and Monanthes (Mes 1995a).



2 varieties :


Sedum surculosum var. luteum (Emberger) Maire (1977)

Sedum surculosum var. surculosum

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