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September 2, 2011
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Southeastern, New Hampshire
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In New Hampshire, there are only a few plants of the Bidens genus with odd
pinnately-compound leaves. That means that along each leaf is one or more sets of
opposite leaflets and the leaf ends in a terminal leaflet (making an odd number of
leaflets):
- Bearded Beggarticks (Bidens aristosa): Flower head with well-developed
rays.
- Small Beggarticks (Bidens discoidea): 3-5 outer bracts that are not
ciliate.
- Big Devil’s Beggarticks (Bidens vulgata): 10-16 (typically 13)
outer bracts that are ciliate.
- Devil’s Beggarticks (Bidens frondosa): This plant. 5-10 outer bracts,
(typically 8) that are ciliate.
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