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On the Lily Poisoning blurb it says "Usually that immediately" that is, not grammatically correct. It should, probably read something like 'Symptoms of lily poisoning, which usually appear immediately or within a few hours of ingestion, include...'
Also at the end it calls it venom. It's not venom, it's poison. Venom has to be injected (like a snake bite), while poison is ingested (like a lily plant). Toxin would also be acceptable.