Erythronium dens canus L. subsp. japonicum (Decaisne)D.Georg. st.& comb.n.   Erythronium japonicum Decaisne , 
subsp. sibiricum (Fischer et al.) Krylov  Erythronium sibiricum  (Fischer et al.) Krylov
subsp. sulevii (Rukšans)D.Georg". st. & comb.n.b
subsp. caucasicum (Woronow)D.Georg. st.& comb.n.


1a. Filaments filiform to subulate, not flattened, less than 1 mm wide; leaf blade 2.5–6.5 cm wide .............................. 1. E. japonicum
1b. Filaments flattened near middle, flattened portion ca. 1.5 mm wide; leaf blade 1–2.5 cm wide ................................ 2. E. sibiricum