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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 Bupleurum

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1 Upper leaves linear, sessile; [section Aristata].
..2 Bractlets (1/5-) 1/4-3/4 as wide as long, enclosing buds and fruits before and after anthesis, ± scarious or shining at anthesis; [section Aristata, subsection Aristata]
..2 Bractlets 1/10-1/4 as wide as long, not enclosing buds or fruits, herbaceous; [section Aristata, subsection Juncea]
1 Upper leaves ovate, perfoliate; [section Bupleurum]
....3 Fruit surface smooth; main cauline leaves mostly 1.5-2.5× as long as wide
....3 Fruit surface tuberculate to reticulate; main cauline leaves mostly 2-5× as long as wide
......4 Fruit 2.2-3.1 mm long, irregularly tuberculate; stylopodium 0.8-1.1 mm long; main cauline leaves 3.5-5× as long as wide
......4 Fruit 3.7-4.7 mm long, reticulate; stylopodium 1.2-1.5 mm long; main cauline leaves 2-3.5× as long as wide
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