Corydalis curviflora Maxim.

in China, Gansu, Ganjia Caoyuan, June 2004 (pictures 2 & 3)
in China, Gansu, Langmusi, June 2004 (picture 1)

Description in Journ. Linn. Soc. xiii. (1886) 37, nomen; et Fl. Tangut.(1889) 41. t. 20.fig. 1-11