What are three wildflowers that can be harmful to humans?

Three wildflowers that can be harmful to humans are:

1. Foxglove (Digitalis purpurea) - Contains toxic compounds that can cause heart issues and gastrointestinal distress if ingested.
2. Deadly Nightshade (Atropa belladonna) - All parts of the plant are highly toxic and can lead to hallucinations, paralysis, or even death if consumed.
3. Larkspur (Delphinium spp.) - Known to cause severe poisoning in humans and livestock, it contains alkaloids that can affect the nervous system.