Osmorhiza

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  1a. Bractlets at base of umbellets absent (infrequently with a reduced, solitary bractlet); styles at maturity strongly outcurved, 0.3–1 mm long [Fig. 352]; flowers all bisexual
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    O. berteroi

    2a. Schizocarp 12–22 mm long, concavely tapered to the apex and forming a terminal beak 1–2 mm long [Fig. 352]; branches of inflorescence and pedicels ascending
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    O. depauperata

    2b. Schizocarp 10–15 mm long, straight or convexly tapered to the apex, without a beak [Fig. 353]; branches of inflorescence and pedicels widely spreading, the pedicels often divaricately so
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  1b. Bractlets present (though some or all may be deciduous during and after maturation of the fruit); styles at maturity nearly straight, 1–4 mm long; flowers bisexual or staminate
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    O. claytonii

    3a. Styles 1–1.5 mm long; roots and foliage with a slight odor and taste of anise; bractlets of umbellets linear; umbellets with 4–8 (–10) flowers (note: include the withered staminate ones for counts made after anthesis)
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    O. longistylis

    3b. Styles 2–4 mm long; roots and foliage with a strong odor and taste of anise; bractlets of umbellets lanceolate; umbellets with (6–) 9–18 flowers

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