DASYPHYLLUM L., 1753
Synonyms :
Leucosedum dasyphyllum (L.) Fourreau (1868) / Oreosedum dasyphyllum (L.) Grulich (1984)
Sedum dasyphyllum var. glaucum Lit. (s.a.) / Sedum dasyphyllum fa glaucum (Lit.) Tavormina (1999)
Sedum globuliferum Pourret (1788)
Sedum nebrodense Gasparrini ex Gussone (1842)
Sedum dasyphyllum var. donatianum Visiani & Saccardo (1869) / Sedum dasyphyllum fa donatianum (Visiani & Saccardo) Tavormina (1999)
Sedum dasyphyllum var. macrophyllum Rouy & Camus (1901)
Sedum dasyphyllum fa oppositifolium Maire (1977)
Sedum dasyphyllum var. elisae Tavormina (1999)
Distribution : Southern and central Europe, Turkey (Anatolia), northern Africa, from sea-level to over 2500 m.
Description (according to 't Thart & Bleij in IHSP 2003) :
Glandular-pubescent glaucous often tufted perennial herbs with short branching and rooting stems.
Leaves densely imbricate, ovoid or subglobose, sessile, obtuse or acute, flattened on the upper face, glaucous, glabrous to densely and coarsely glandular-pubescent, sometimes sticky, 3.5 – 7 mm; flowering branches erect or ascending, usually simple and densely glandular-pubescent with loosely imbricate alternate leaves, to 12 cm tall.
Inflorescences cymes with (1-) 2 (-3) cincinni, bracts small, ovate, pedicels shorter than the flowers.
Flowers 5-merous (rarely 6-merous); sepals broadly sessile, ovate, 1 – 5.5 mm, petals basally free, oblong-elliptic to lanceolate, (sub-) acute, white, often with a red keel or pinkish, outside glaucous, purplish-green, 3 – 5 mm, anthers red.
Cytology : 2n = 28, 42, 56, 70, 84, 96, 112
Note :
Ray Stephenson writes (Sedum, Cultivated Stonecrops, 1994, p. 133) : "The only species that could be confused with Sedum dasyphyllum is S. brevifolium, which for many years was considered a form of S. dasyphyllum. Sedum dasyphyllum is soft to the touch, being easily squashed between the fingers. Moreover, the leaves tend to fall off in profusion if the plant is disturbed, in contrast to leaves of S. brevifolium, which do not fall easily."
On peut ajouter également que les feuilles de S. dasyphyllum sont aplaties sur la face supérieure, ce qui n'est pas le cas de celles de S. brevifolium.
Il s'agit d'une espèce très polymorphe, que ce soit pour la couleur, la taille et la forme des feuilles ou la pubescence. De nombreuses formes et variétés ont été décrites, mais il existe tellement de formes intermédiaires qu'il est difficile de justifier l'acceptation de ces taxons en tant que tels.
't Hart & Bleij les ont tous rangés dans la synonymie de deux variétés discriminées essentiellement par le caractère décussé ou alterne des feuilles :
Sedum dasyphyllum var. dasyphyllum
Sedum dasyphyllum var. glanduliferum (Gussone) Moris, 1840
Photos showing the variability of Sedum dasyphyllum
Ray Stephenson va plus loin dans le regroupement, il dit (Sedum, Cultivated Stonecrops) : "I think we must accept that the species is exceptionally polymorphic". Et il précise (ICN forum, 2012) : "I'd be happier if there were no varieties accepted. I think though that the name glanduliferum refers to hairy plants usually with a particular leaf arrangement. Var. dasyphyllum is usually glabrous (except perhaps for inflorescences). In my experience, every combination of leaf-size, leaf-indumentums and leaf-arrangement exist in the wild and this is ignoring the fact that some clones have 5-partite flowers while others have 6-."
Plantes à feuilles opposées décussées (≡ var. dasyphyllum de l'IHSP)
Observations sur le Mont Rose - Massif de Marseilleveyre - Marseille (France, Bouches du Rhône), alt. 10 m, terrain calcaire / calcareous soil.
Crassulaceae observées: Petrosedum ochroleucum, P. sediforme, Sedum acre, S. album, S. dasyphyllum, S. litoreum.
19 mars 2011 :