MIDDENDORFFIANUS * (Maximowicz) 't Hart, 1995

Synonyms :

Sedum middendorffianum  Maximowicz (1859) / Sedum aizoon ssp. middendorffianum (Maximowicz) Fröderström (1931) / Sedum kamtschaticum ssp. middendorffianum  (Maximowicz) R.T.Clausen (1946) / Aizopsis middendorffiana  (Maximowicz) Grulich (1984)

Sedum hybridum  Trautvetter & C.A.Meyer (1856)  

Sedum middendorffianum var. diffusum  Praeger (1921) / Sedum middendorffianum cv. diffusum  (s.a.)

Sedum middendorffianum ssp. arcuatum  Voroshilov & Shlothauer (1984)


Subgenus Aizoon


Distribution : Russia (E Siberia to the Ochotsk coast), China, Japan, North Korea; rock crevices and stony soils in forests.



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


Glabrous herbs with creeping woody branching rhizomes and numerous, straight, persistent, suberect, short, leafy stems arising from the base of old stems, flowering in late summer.


Leaves alternate, spreading, linear to linear-lanceolate or linearly spatulate, lower leaves more spatulate, (sub-) obtuse, obtusely crenate to deeply dentate in the upper part, canaliculate, concave, fleshy, to 40 x 4 - 7 mm.


Flowering branches 10 - 30 cm.


Inflorescences rather laxly paniculate-corymbiform, often with elongated many-flowered branches.


Flowers 5-merous, (sub-)sessile, sepals linear, (sub-)obtuse, spreading, 2.5 - 4 mm, petals connate for up to 2 mm, lanceolate to linear-lanceolate, acuminate, carinate, 5 - 6 mm, bright yellow, filaments to 3 mm, yellow, anthers orange.

Cytology : 2n = 32


The position of this variable species within subgenus Aizoon is uncertain. Praeger (1921a) described a variety which differs mainly in the width and dentation of the leaves.


* As the plant is named for A. T. von Middendorff - the correct name is P. middendorffianus - IHSP has spelt it wrongly as P. middendorfianus.

Photos Ray Stephenson

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