Sedum
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ALSINEFOLIUM Allioni, 1785

Synonyms :

Oreosedum alsinefolium  (Allioni) Grulich (1984)

Sedum ellipticum  Miégeville (1867).

 

Distribution : North-western Italy (Piemont, northern Liguria)

 

 

Description (according to IHSP 2003) :

 

Fragile much-branched erect annuals, to 15 cm tall, glandular-pubescent throughout.

 

Leaves alternate, flat, spatulate or pseudopetiolate with an oblong or elliptic lamina, sometimes subsessile, to 15 (-20) x ± 8 mm, obtuse or rounded, green or reddish-brown.

 

Inflorescences usually many-flowered cymes, laxly branched, pedicels (5-) 9 (-15) mm.

 

FIowers 5-merous, 7 - 9 mm diameter, reflexed before anthesis, sepals broadly sessile, equal, linear-oblong to elliptic or triangular-ovate, 2 x 0,6 mm, petals basally connate for 2 - 3 mm, lobes broadly ovate to cordate, 2,5 - 3,5 x 2,5 - 3 mm, long acuminate, white, filaments white, anthers red or pink, rarely yellowish.

 

Cytology: 2n = 26.

 

Frequently described as perennial, e.g. by Pignatti (1982: 501). Closely related to the vicariant S. fragrans (Ser. Alsinefolia). Artificial hybrids between the 2 species are sterile.

 

Ray Stephenson writes (Sedum, Cultivated Stonecrops, 1994, p. 137) : " Sedum fragrans is the perennial form of S. alsinefolium, a species not in general cultivation. For many years descriptions of the latter were conflicting, as two apparently disjunct colonies had contrasting features : S. alsinefolium from the Italian / French border is an annual calcifuge, while work by 't Hart (1983a) showed that perennial plants of the limestone districts further south, once considered synonymous, have a different chromosome count. In addition, the annual form [S. alsinefolium] has simpler inflorescences and smaller flowers with shorter tubes."

 

Plant in cultivation :



Flowers of S. fragrans (left) and S. alsinefolium (right)


Photos Ray Stephenson



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