Corydalis cheilanthifolia Hemsl. (China) – A very rare and probably ephemeral escape from cultivation or throw-out. Recorded in the Brussels area in 1918. In 2013 also recorded in nature reserve De Maten in Genk (a single plant, foot of Quercus tree).
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Selected literature:
Anonymous (1980) Corydalis cheilanthifolia: Lerchensporn mit farnartigen Blattern. Gärtn. Bot. Brief 63: 49.
Denters T. (2014) Flora op drift - Varenhelmbloem. Floron Nieuwsbrief 20: 3 [available online at: http://www.floron.nl/Portals/1/FLORON-Nieuws/FLORONnieuws%2020.pdf]
Taxonomic name: