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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 Dipsacus

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1 Principal (lower) stem leaves laciniate-pinnatifid, cut at least halfway to the midrib; stems to 3 (-4) m tall
1 Principal (lower) stem leaves entire or toothed; stems to 2 (-3) m tall.
..2 Bracts on the receptacle 7-30 mm long, with straight apical spines, these stiff but flexible; bracts of the involucre 1-13 cm long, curved upward
..2 Bracts on the receptacle 12-14 mm long, with recurved apical spines, these rigid; bracts of the involucre 1-5 cm long, spreading more or less horizontally
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