Question: Do both Bidens and Pimelea have poisonous species in them?
Sentence (from "Bidens"): The common names beggarticks, black jack, burr marigolds, cobbler's pegs, Spanish needles, stickseeds, tickseeds and tickseed sunflowers refer to the fruits of the plants, most of which are bristly and barbed, with two sharp pappi at the end.
Relevant evidence: Yes