Bidens conjuncta is an erect, perennial herb in the Asteraceae (sunflower) family, 0.7 to 2 m (2.3 to 6.6 ft) tall, with horizontal or ascending lateral branches. The leaves are simple or pinnately (two rows of lobes, veins, leaflets, lateral branches, or appendages along an axis) compound, 6 to 15 cm (2.4 to 6 in) long, comprised of 1 to 5 leaflets (ultimate unit of a compound leaf) which are ovate-lanceolate (oval-lanced shaped), 5.5 to 10.5 cm (2.2 to 4 in) long, 3 to 6 cm (1.2 to 2.4 in) wide, densely pubescent (hairs) along veins, and have serrate (toothed) margins. Flower heads number from 15 to 45 and bear 8 to 15 disk florets (small flower that is part of a cluster) in compound cymes, and corollas (all of the petals of a flower) are yellow. Achenes (dry fruit remaining closed at maturity) are brownish black, straight or slightly curved, 12 to 20 mm (0.5 to 0.8 in) long, and 1 to 1.2 mm (0.04 to 0.05 in) wide.