| Kingdom | Plantae | Plants, but not fungi, lichens, or algae |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Asterales | Flowering plants with a central disk flower and surrounding petals, like daisies |
| Family | Asteraceae | The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers |
| Genus | Bidens | From Latin bis, “twice,” and dens, “tooth,” for the pair of bristles on the achenes |
| Species | connata | United, having opposite leaves joined together at their base |
Bidens connata Muhl. ex Willd. var. ambiversa Fassett
Bidens connata Muhl. ex Willd. var. anomala Farw.
Bidens connata Muhl. ex Willd. var. fallax (Warnst.) Sherff
Bidens connata Muhl. ex Willd. var. gracilipes Fernald
Bidens connata Muhl. ex Willd. var. inundata Fernald
Bidens connata Muhl. ex Willd. var. petiolata (Nutt.) Farw.
Bidens connata Muhl. ex Willd. var. pinnata S. Watson
Bidens connata Muhl. ex Willd. var. submutica Fassett
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