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Keyed in multiple places:

Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Aphyllon

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1 Flowers (1-) 6-15 (-20) per stem; stem 1.5--15 (-22) cm tall; pedicels 1-7 (-15) cm long, similar in length to the stem axis; [periphera to our region, s. IL, c. OK, and nc. TX northwards and westwards]
1 Flowers 1-2 (-4) per stem; stem 1-5 (-7) cm tall; pedicels (1-) 2-11 (-17) cm long, longer than the stem axis; [widespread in our region]

Key to Orobanche

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1 Flowers solitary on a long pedicel (appearing as a scape, the true stem entirely underground or nearly so)
1 Flowers several-many, sessile or subsessile in a dense spike.
..2 Calyx 5-lobed, the lobes subequal, all well-developed
..2 Calyx 2-4-lobed, rarely 5-lobed, but then the fifth lobe minute and much smaller than the other lobes.
....3 Calyx divided to the base into 2 lateral halves, these usually 2-lobed, the 4 lobes long-attenuate or caudate; stem unbranched
....3 Calyx tubular, with 4 (-5) lobes about the length of the calyx tube; stem branched (except in depauperate individuals)
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