Corydalis flavula
Yellow fumewort
Image of Corydalis flavula

Photo by Brad Slaughter 

Key Characteristics

Small sprawling annual forb (10-30 cm) of forested floodplains and ravines; leaves dissected and often glaucous; flowers pale yellow with a short spur.

Status and Rank

  • State Status: T
  • State Rank: S2
  • Global Rank: G5


County NameNumber of OccurrencesYear Last Observed
Distribution map for Corydalis flavula

Updated 5/15/2018. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.


Occurs in floodplain forests and mesic hardwood forests in southwestern Lower Michigan. The majority of occurrences are known from degraded, successional dry-mesic southern forest in south-central Lower Michigan, where the species is typically associated with the non-native black locust.

Natural Community Types


For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Associated Plants

In floodplain forests, it grows with such species as silver maple, green ash, red maple, black walnut, hackberry, black maple, Ohio buckeye, box elder, black ash, black willow, cottonwood, swamp white oak, sycamore, spice bush, redbud, paw paw, Kentucky coffee tree, red mulberry, Virginia blue-bells, common trillium, red trillium, stinging nettle, poison ivy, moneywort, Canada moonseed, wild ginger, skunk cabbage, honewort, kidney-leaved buttercup, false mermaid, rough bedstraw, mayapple, blue eyed Mary, and Canada goldenrod. In degraded dry-mesic southern forests, the species is associated with black maple, red maple, sugar maple, garlic mustard, green ash, annual bedstraw, white avens, black walnut, hairy sweet-cicely, smooth sweet-cicely, pellitory, clearweed, Canada bluegrass, black cherry, choke cherry, white oak, red oak, black oak, prickly gooseberry, common blackberry, black raspberry, dewberry, sassafras, common chickweed, and poison-ivy.


Little is known of the management regime necessary to maintain this species. This species germinates in the late summer and fall, then overwinters and blooms in early spring (noted as a winter annual).

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at [Accessed Aug 18, 2018]

More Information

See MNFI Species Abstract


Survey References

Technical References

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