ANGUSTA  Nakai, 1914

Synonyms :

Sedum angustum  (Nakai) Nemoto (1936) (nom. illeg., Art. 53.1)

Rhodiola ramosa  Nakai (1914)

Sedum fenzelii  Fröderström (1936)

Rhodiola komarovii  Borissova (1939) / Sedum komarovii  (Borissova) Chu (1959)

Sedum ohbae  Kozhevnikov (1989)

Type (lectotype) : Mori 44, Korea.

Subgenus Rhodiola, section Rhodiola

Etymology : Lat. ‘angustus’ = narrow, > probably for the leaf shape.

Distribution : E Russia, N China (Heilongjiang), N Korea; alpine grasslands, rocks, 1700 - 2600 m.

Description (by H. Ohba in IHSP, 2003) :

Dioecious, to 14 cm taIl, rhizomes slender, sometimes branching, often surculose.

Flowering stems 2 - 5, 1.2 - 2 mm in diameter, glabrous, nearly smooth.

Leaves densely arranged throughout, ascending to spreading, sessile, linear to linear-elliptic, 7 - 16 x 2 - 4 mm, glabrous, nearly smooth, tip truncately rounded to obtuse, base rounded truncate, margin entire to sparsely and irregularly crenulate.

Inflorescence compactly 30- to 60-flowered, 1 - 1.7 x 1.2 - 3.5 cm in diameter, pedicels < 2 mm, smooth.

Flowers : Calyx 3.5 - 5 mm, smooth, sepals linear, 2.5 - 3.1 mm (male) or 3 - 4.5 mm (female), petals creamy-yellow, narrowly spatulate (male) or linear to linear-subulate (female), 4.8 - 5.5 mm (male) or 4.5 - 5 mm (female), stamens 4 - 6 mm, anthers purplish-red, carpels 5 - 8 mm, each with 10 - 14 ovules, ventral side straight, styles (0.8-) 1 - 1.2 mm, fruit to 12 mm, seeds linear, 2.5 - 2.7 mm, tailed, brown, with low longitudinal ridges. 
 

Flowering time : Late June to mid August.