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See list of 27 species in this genus

In the following key, achene length does not include the apical tubercle, and stem widths are for dried, pressed specimens. Also, the dimensions of tubercles on freshly collected specimens can be very different from those on dried material, particularly during the early stages of fruit maturation. Therefore, fruits should be dry prior to measurement of tubercles. Reference: Smith et al. (2002).

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