Vancouver Island Beggar-ticks: Bidens amplissima (Synonyms: Bidens cernua var. elata, Bidens elata) - Flower heads with ray flowers. Leaves tripartite or 3-lobed.
Beck's Water Marigold, Water-marigold, Water Marigold: Bidens beckii (Synonyms: Megalodonta beckii, Megalodonta beckii var. beckii, Megalodonta beckii var. hendersonii, Megalodonta beckii var. oregonensis) - Plants submerged. Leaves filiform-dissected.
Bur Marigold, Nodding Beggarticks, Nodding Beggar-ticks, Nodding Beggars-ticks, Nodding Beggar Ticks: Bidens cernua (Synonyms: Bidens cernua var. cernua, Bidens cernua var. elliptica, Bidens cernua var. minima) - Flower heads with ray flowers. Leaves simple.
Beggarticks with flower heads lacking ray flowers.