Corydalis pseudoamplisepala D. Wang (Papaveraceae), a new species from NW Hubei, China, is described and illustrated. It is most similar to C. amplisepala, but differs by having sepals that are reniform (vs. broadly ovate to suborbicular), 1.5–2 × 1–1.5 mm (vs. 5–7 × 4–6 mm) and deeply laciniate-dentate (vs. richly fimbriate-dentate), outer petals without crest (vs. with crest), and lower petal broadly saccate at center and with a distinct pouch at base (vs. almost straight, or slightly saccate at center and with an indistinct pouch at base). Supplementary description of flower color, lower petal and seed morphology of C. amplisepala is provided.