Milkweed

ASPCA's toxic principles: cardiotoxins (steroidal glycosidic cardenolides) in some species, neurotoxins in others. Clinical signs: vomiting, profound depression, weakness, anorexia, and diarrhea are common, potentially followed by seizures, difficulty breathing, rapid weak pulse, dilated pupils, kidney or liver failure, coma, respiratory paralysis, and death. NC State Extension's species-specific toxic principles for Asclepias incarnata are cardiac glycosides and resinoids; the milky sap can also cause contact dermatitis and eye irritation on contact. This is a genuinely toxic plant, not a minor one: but it is also the Monarch butterfly's essential host plant, and this app does not discourage planting it for that reason.