Characters;"T. austrosibiricus";"T. chinensis";"T. macropetalus";"T. asiaticus" "Stem height, cm";(20)40–70;"70–150 (180)";"70–150 (180)";20–75 "Underground organs";"simple rhizomes";"multi-headed basal part";"multi-headed basal part";"multi-headed basal part" "Length/width of the basal leaf blade";4–7/5–8;6–15/7–25;6–15/7–25;4–7/5–8 "Number of flowers on shoot";1(2);2–7(1);2–7(1);1–2(3) "Flower diameter, cm";3.5–4.5(5.5);4–5(6);(4)5–7(8);3–4(5) "Number of sepals";8–10(14);8–12;5–7;10–20 "Petal length, mm";20–28;25–35;"30–35 (40)";14–22 "Petal apex";"Acute, narrowed smoothly from the middle part of the petal";"Acute, narrowed abruptly upwards";"Acuminate, narrowed smoothly upwards";Rounded "Distance from nectary pit to petal base, mm";2.5–3;3.5–4;3.5–4.5;1.5–2 "Sepals/Petals length ratio";<1;<1;<1;≥1 "Petal/Stamen length ratio";2–3.5/1;2–3/1;3.5–5/1;1.5–2/1 "Follicle length, mm";10–15;14–18;14–22;8–12 "Style length, mm";1.5–3;3–4;3.5–5;0.5–1(2) "Persistent style shape";"Almost erect at the base, above: bent arc-like inwards";"Bent outwards at the base, above: bent slightly arc-like towards the centre of the flower";"Bent outwards at the base, above: bent slightly arc-like towards the centre of the flower";"Bent sharply arc-like towards the centre of the flower"