Corydalis popovii

Few-flowered racemes of gargantuan (up to 2 inches long), maroon-headed flowers with white, pink-flushed, arched tails open from top to bottom in April.  One of the crown jewels of the genus, and rarely available.  Sun and well aerated soil are a must (i.e., wet or heavy soils will not do it). Steppe/Montane; Tajikistan. Zone 5.