There are 3 tipes of not so well known Corydalis are growing In Russian Far East
Corydalis vorobievii, with 20cm of height, with a small tuber - azure blue color.
Corydalis woroshilowii, it is a huge plant with height - 25cm. with a big amount of flowers. Up to 200 flowers with azure blue color.
Corydalis ussuriensis, it is a plant with a big tuber, the height is around 20cm. with few large flowers. up to 10 flowers, 3 times more than C.ambigua has with azure blue color.
The difference between Corydalis from Far East and others is that it has a large flowers and It has round or oval box with seeds.
There is Corydalis ussuriensis is growing in North Korea with pink or very rare white color.
All 3 Corydalis are growing in Europe without the problem. it can stand up to -40C
There is also interesting Corydalis repens is growing in North Korea, large plant with the different form and color of leaves. The colors are white, pink and blue