In message , Peter Robinson
writes

So my questions: can you eat perpetual sweet peas? As mangetout, sugar
snaps or shelled peas? Do I want to?

"Although no records of toxicity have been found for this plant, the
seed of some species in this genus contain a toxic amino acid that can
cause a severe disease of the nervous system known as 'lathyrism' if
they are eaten in large amounts (although small quantities are said to
be nutritious)[65, 76]. Great caution is advised."

http://www.pfaf.org/database/plants....rus+latifolius

"Toxic to mammals"

http://www.evergreen.ca/nativeplants...t.php?ID=06412
--
Stewart Robert Hinsley