TUBEROSUM Cosson & Letourneux, 1875

Synonyms :

Rhodiola tuberosa  (Cosson & Letourneux) H. Jacobsen (1973)

Poenosedum tuberosum  (Cosson & Letournaux) Holub (1984).

Distribution : Northern Tunisia, adjacent Algeria.

Description (according to IHSP, 2003) :

Glabrous perennial herbs forming small rosettes at the tip of a simple (rarely branched) subterranean monopodial rhizome to 10 x 1 cm diameter.

Leaves alternate, sessile, oblong-elliptic, flat, 10 - 30 x 3 - 6 mm, subacute to rounded, bright green.

Inflorescences : Flowering branches axillary, erect or ascending, to 15 cm, loosely leafy, leaves alternating, oblong, flat, 10 - 15 x 3 - 5 mm, rounded, with hyaline cells along the margins, inflorescences cymes with (1-) 2 cincinni and 3 - 15 (-20) flowers, bracts 2 per flower.

FIowers 5-merous, sessile to shortly pedicellate, sepals broadly sessile, unequal, oblong-elliptic, obtuse or rounded, 5 mm, petals basally connate for ± 0,3 mm, elliptic-lanceolate, 7 - 10 mm, mucronate, filaments yellow, anthers yellow.

Cytology: 2n = 46.

Belonging to the comparium of Ser. Alpestria A. Berger ('t Hart 1991).

See also S. multiceps & S. x battandieri.