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Corydalis micrantha   (Engelm. ex A. Gray) A. Gray  subsp. micrantha 
Pottawatomie County, Kansas
Winter annual
Height: 4-12 inches
Family: Fumariaceae - Fumewort Family
Flowering Period:   March, April
Stems: Erect to ascending, usually several, simple or sparingly branched, glabrous, often waxy.
Leaves: Alternate, stalked below, sessile above, oblong to ovate in outline, pinnately compound; primary segments 2 to 3.5 inches long, divided again; smallest segments mostly elliptic, glabrous, often waxy.
Inflorescences: Racemes, 6-20-flowered, terminal.
Flowers: Irregular; sepals 2, ovate, rough, withering early; corollas with 2 pairs of pale yellow petals; spurred petal prominent, about 1/2 inch long; spur tip distinctly spherical; stamens 6, in 2 groups of 3.
Fruits: Capsules, 1/2 to 1 inch long, erect or upward-curved; seeds numerous, circular, shiny, black.
Habitat: Disturbed sites, roadsides, open woods, and fields, in sandy soils.
Distribution: East 2/3 of Kansas.
Comments: From Greek korydallis or "crested lark", because of the resemblance of the spur on the flower to the hind claw of a lark. Slender fumewort is one of the earliest blooming spring flowers.
 See Large-bracted corydalis

Slender fumewort inflorescence
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Slender fumewort flowers
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