Erysimum

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  E. repandum

  1a. Fruiting pedicels thick, ± the same diameter as the siliques, widely spreading at or nearly at right angles to the axis [Fig. 519]; rachis of inflorescence often flexuous
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  1b. Fruiting pedicels slender, narrower than the siliques, erect to spreading-ascending; rachis of inflorescence straight
  • See list of 3 species in 2a
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    2a. Petals (7–) 8–25 (–30) mm long; sepals (4–) 5–14 mm long; siliques (20–) 40–70 mm long
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      E. capitatum

      3a. Petals 13–25 (–30) mm long, commonly orange to orange-yellow; sepals 7–14 mm long
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      3b. Petals (7–) 8–18 mm long, commonly yellow; sepals (4–) 5–10 mm long
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        E. odoratum

        4a. Petals 12–18 mm long; sepals 6–10 mm long; anthers 2 mm long or longer
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        E. hieraciifolium

        4b. Petals (7–) 8–10 (–12) mm long; sepals (4–) 5–6 mm long; anthers 1–2.2 mm long
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    2b. Petals 3.5–7 (–8) mm long; sepals 2–5 (–6) mm long; siliques 15–50 mm long
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      E. cheiranthoides

      5a. Anthers 0.4–0.6 mm long; sepals 2–3.5 mm long; petals bright yellow, 3.5–5 mm long; siliques glabrous to sparsely pubescent, 15–20 (–30) mm long, pubescent on the inner surface of the valves
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      E. inconspicuum

      5b. Anthers 1.5–2.5 mm long; sepals 4–5 (–6) mm long; petals pale yellow, 5–7 (–8) mm long; siliques pubescent, 30–50 mm long, glabrous on the inner surface of the valves

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