Petrocodon retroflexus Q. Zhang & J. Guo
Petrocodon Hance Perennial herb. Rhizomes up to 18 cm long, 1.3–2.0 cm across. Leaves 5–10, basal, long petiolate; leaf blade papery,ovate, broadly ovate to elliptic, 8–20 cm long, 5–15 cm wide, obtuse at apex, cordate and asymmetrical at base, with crenate margin;...