In article , Kay Easton
writes
Yeah, but that's Solanaceae, Leguminaceae and umbeillferae - 3 families
full of nasty chemicals. Bereberidaceae (Mahonia's family) doesn't have
many obviously poisonous species, does it?

Podyphyllum peltatum

http://www.ces.ncsu.edu/depts/hort/c...on/Podoppe.htm

You're right to point out that relying on relationship to an edible
species isn't advisable, but it's a better rule of thumb in some
families than in others.

--
Stewart Robert Hinsley