Russia Flora: Plant 10-40 cm tall. Rootstock short, ascending or vertical. Stem erect, simple, rarely with 1-2 lateral shoots, finely furrowed. Basal leaves 1-3, with petioles up to 15 cm long, blade 4-10 cm long and wide, pentagonal, dissected into 5 rhombic segments with serrate-dentate lobes. Stem leaves 1-2(4), on short petioles or sessile, smaller in size. Flower stalks 1-10 cm long, elongating in fruit up to 15(30) cm. Flowers 1.5-3 cm in diameter. Sepals 9-12(14), 0.6-1.5 cm long, 0.5-1 cm wide, broadly elliptical or rounded-rhombic, sulfur-yellow, occasionally with orange tinge. Nectariferous petals 5-10 mm long, linear, yellow-orange; nectary pit at 1-2 mm height. Anthers up to 2 mm long, oblong-elliptical. Carpels 5-12, up to 13 mm long. Style 2-3 mm long, more or less curved.

Distribution: Okhotsk (central, south), Aldan, Amgun (Figure 3). - In meadows and gravelly areas, along river valleys, edges of swamps, as well as in sparse forests, on hills, rocky slopes and cliffs, up to the alpine zone of mountains, often on limestone outcrops. Flowering period: June-July. - General distribution: Eastern Siberia. - Described from Siberia.

Note: The lectotype of T. sibiricus Schipcz. - "Lena River valley, Bulun (1615 versts from Yakutsk). July 3, 1914, fl. ... V. A. Kashkarov" (LE), - was selected by V. N. Siplivinsky (1972, cited work: 171) to replace the type indicated by N. V. Shipchinsky in "Flora of the USSR" (1937, vol. 7), - "... from vicinity of Ayan", which is the holotype of another, well-distinguished species - T. membranostylis Hult.