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The milkweed subfamily contains 348 genera distributed almost worldwide. Our milkweeds of genus Asclepias that exist in the North American temperate zones are forbs having toxic sap, containing cardenolide in the stems and leaves that are poisonous to animals except for the milkweed insects, for which the plants serve as the larval host. Such is the case for the imperiled Monarch butterfly, as well as the Queen butterfly and several species of moth. 
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Johnny Armstrong, Author
#Biodiversity advocate. Ecosystem Restorationist. Steward of an old-growth forest and woodland in northern Louisiana. #ForestFolkMatter #ScienceMatters 
“Up there on your bookshelf between Tolkien and Watership Down is where this book belongs. As an anthropomorphic adventure that winds through the realm of animals possessing courage, savagery, perseverance, and ultimately wisdom in the face of mounting evil threats – humans disconnected from the natural world – the tale is relevant, if not necessary.”
Kelby Ouchley, author of Bayou Diversity: Nature & People in the Louisiana Bayou Country Find an Indie Bookstore
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