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JAPONICUM Siebold ex Miquel, 1866

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

Distribution : China, Taiwan, Japan, Korea.



Description (according to 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.

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