Sedum middendorffianum Maximowicz, Mém. Acad. Imp. Sci. St.-Pétersbourg Divers Savans 9: 116. 1859; Aizopsis middendorffiana (Maximowicz) Grulich; Sedum aizoon Linnaeus subsp. middendorffianum (Maximowicz) Fröderström; S. middendorffianum var. diffusum Praeger.

Herbs perennial. Rootstock branched, creeping, woody. Stems numerous, tufted, basally branched, erect or ascending, 10-30 cm, usually persistent. Leaves alternate; leaf blade linear-spatulate, 1.2-2.5 × 0.3-0.5 cm, base cuneate, margin apically serrate, apex obtuse. Inflorescence often with divergent branches, many flowered. Flowers unequally 5-merous. Sepals linear, 2-3 × 0.6-0.8 mm, apex obtuse. Petals yellow, lanceolate to linear-lanceolate, 5-11 × 1.8-3 mm, apex acuminate and mucronate. Stamens 10, shorter than petals; filaments yellow; anthers purple. Nectar scales minute, margin subentire. Carpels lanceolate, ca. 6 mm, base connate for ca. 2 mm. Styles ca. 1 mm. Follicles stellately subhorizontal, apex shortly beaked. Seeds ovoid, minute. Fl. Jun-Aug, fr. Aug-Sep.

Among rocks in forests in mountainous areas; 300-1000 m. Jilin, Liaoning [Japan, Korea, Russia].