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See list of 3 species in this genus
  • 1a. Upper leaves with the sheath shorter than the blade; lateral ribs of schizocarp thick and corky; plants growing at upper edge of or just behind Atlantic coast beaches
  • 1b. Upper leaves with the sheath longer than the blade or the blade ± absent; lateral ribs of schizocarp thin and wing-like; plants not of seashores
    • 2a. Ovary puberulent; ultimate segments of leaf blades 2–6 (–7) cm long, with an obtuse apex; pericarp tightly adherent to seed
    • 2b. Ovary glabrous; ultimate segments of leaf blades (4–) 8.5–12 (–15) cm long, with an acute apex; pericarp loose from seed at maturity

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