HaaRoy wrote:

Family
Ranunculaceae


Mode
Ingestion
Poisonous Part
All parts.
Symptoms
Burning of lips and mouth, numbness of throat; intense vomiting and
diarrhea, muscular weakness and spasms, weak pulse, paralysis of the
respiratory system, convulsions; fatal.
Toxic Principle
Alkaloids delphinine, ajacine, and others.
Severity
HIGHLY TOXIC, MAY BE FATAL IF EATEN!

Yes. But then so are lots of plants. It is easier to list the plants which
have absolutely no poisonous parts.
Even common food plants can be seriously toxic if you are dumb enough to
eat the wrong parts.

The general rule is do not eat plant material unless you know for certain
that it is edible.
A fair number of common ornamentals are moderately to severely toxic if
eaten.

Regards,
Martin Brown