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See list of 3 species in this genus

Reference: Ownbey (1947).

  • 1a. Corolla purple (rarely white, pink, red, or purple-blue), 15–25 (–30) mm long; plants perennial; stem arising from a tuber
  • 1b. Corolla pale yellow or bright yellow, 7–16 mm long; plants annual or biennial; stem arising from a taproot
    • 2a. Corolla pale yellow, 7–9 mm long; upper outer petal (i.e., the spurred petal) with a conspicuous undulate to toothed crest toward the tip; spur 1–1.5 (–2) mm long; sepals ca. 0.3 mm long
    • 2b. Corolla bright yellow, 12–16 mm long; upper outer petal with merely a keel, lacking a toothed crest; spur 4–5 mm long; sepals 1–2 mm long

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 Show photos of:   Each photo represents one species in this genus.