JAPONICUM Siebold ex Miquel, 1866

Sedum japonicum Siebold ex Miquel, Ann. Mus. Bot. Lugd. Bat. 2: 156. 1866.

Distribution : China, Taiwan, Japan, Korea.

Description (by 't Hart & Bleij in IHSP, 2003) :

Perennial fleshy herbs with tufted creeping and rooting much-branched stems.

Leaves alternate, narrowly cylindrical-oblong, rounded.

Inflorescences cymes.

FIowers 5-merous, sessile, sepals basally free, shortly spurred, oblong-linear, obtuse or rounded, slightly cuneate at the base, ± 3 x 1 mm, petals ovate-spatulate, acute, slightly cuneate at the base, yellow, slightly longer and wider than the sepals.

Cytology : 2n = 18, 20, 30, 38

Morphologically as well as cytologically an extremely variable species. Unfortunately, the name is an illegitimate homonym of S. uniflorum Rafinesque (1810) (= Phedimus stellatus).

4 subspecies : 
 

Sedum japonicum Miquel ssp. boninense (Tuyama) R. Stephenson comb.nov.

Sedum japonicum Miquel ssp. japonicum

Sedum japonicum Miquel  ssp. oryzifolium (Makino) R. Stephenson comb.nov. 

Sedum japonicum Miquel  ssp. uniflorum (Hooker & Arnott) R. Stephenson comb.nov.