Trollius austrosibiricus Erst & Luferov

Herbs perennial, (20–)40–70 cm high. Rhizomes simple or slightly branching, short, erect or arched, with a bundle of adventitious roots. Stems straight, simple, less often weakly branched, slightly grooved. Basal leaves (1–)2–4, spirally-alternate, congested in a basal rosette; petioles 10–25(–35) cm long; blades 4–7 × 5–8 cm, rhomboid, 3–5(–7)-lobed, segments dissected almost to the midrib into lobes, ending sharply with edges dentate. Cauline leaves 2–5(–7), opposite, with short petioles or sessile, gradually smaller towards the apex. Inflorescence terminal, 1(–2)-flowered. Flowers 3.5–4.5(–5.5) cm diam.; pedicels 5–12 cm long, elongating in fruit up to 8–15 cm long; sepals 8–10(–14), 1.3–2.4 × 0.8–1.5 cm, rhombic-ovate or broadly elliptic, reddish-orange or yellow-orange; petals 9–18, 2–2.8 × 0.2–0.3 cm, oblong-lanceolate, slightly wider at middle, base narrow cuneate, apex acute, orange- or reddish-orange coloured, nectarostigma 2.5–3 mm from base; stamens more than (9)10, filaments 7-11mm long, anthers 1.5–2(–2.5) mm long, linear; Fruits aggregate, with 9–14(17) follicles, 10–15 mm long, persistent style 1.5–3.0 mm long, slightly incurved.

Trolliusaustrosibiricus is endemic to mountainous areas of the southern part of Western and Central Siberia. Russia: Tuva Republic, Kemerovo district, Krasnoyarsk territory, Khakassia (Figure 1).