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Caulophyllum
See list of 2 species in this genusReferences: Haines (2003c), Loconte (1997).
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1a. Flowers subprecocious, numbering mostly 4–18 per inflorescence; sepals mostly purple to purple-brown (rarely yellow), 6–9 mm long; filaments 1.5–2.5 mm long; carpels 3–5 mm long; styles 1–2 mm long
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1b. Flowers nearly coetaneous, numbering mostly 5–70 per inflorescence; sepals yellow to green, often tinged with purple (rarely purple to purple-brown), 3–6 mm long; filaments 0.5–1.5 mm long; carpels 1–3 mm long; styles 0.25–1 mm long
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Each photo represents one species in this genus.