Our common species, Corydalis aurea, plus also Capnoides sempervirens, share an interesting ecological situation with a few other plants, such as Chenopodium capitatum and Leucophysalis grandiflora. These are most typical of disturbed ground (especially sand and calcareous gravels) at previously forested sites about 1–3 years after disturbance (clearing, bulldozing, fire, pasturing, etc.). Unless the area continues to be disturbed, these species then die out. On rock outcrops, shores, and places where soil is disturbed by erosion or overthrown tree roots, there are more natural niches for these species than the easily noticed human-disturbed ground.
1. Plants perennial from a conspicuous, round corm; flowers purple.
1. Plants tap-rooted, biennial or winter-annual (or sometimes annual); flowers yellow.
2. Mature flowers (10–) 11–14 mm long, including a spur ca. (2.5–) 3.5–4 mm long; seeds shiny but reticulate.
2. Mature flowers 7–10 (–11) mm long, including a spur ca. 1–1.5 (–2) mm long; seeds very smooth and shiny.
All species found in Corydalis
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 30, 2017. http://michiganflora.net/genus.aspx?id=Corydalis.