• University of California Safe and Poisonous Garden Plants
https://ucanr.edu/sites/poisonous_safe_plants/ • California Poison Control System
https://calpoison.org/topics/plant • Science Direct: Learn More About Zigadenus
https://www.sciencedirect.com/topics/pharmacology-toxicology-and-pharmaceutical-science/zigadenus/pdf • Are Elderberry Bushes Poisonous, Norm’s Gardens
https://normsfarms.com/blogs/growing-and-harvesting-elderberry/are-elderberry-bushes-poisonous • Guide to Poisonous Plants – College of Veterinary Medicine and Biomedical Sciences – Colorado State University
https://csuvth.colostate.edu/poisonous_plants/ • Wikipedia
https://en.wikipedia.org/wiki/Achillea_millefolium • Is Agave Poisonous? SF Gate, November 15, 2019.
https://homeguides.sfgate.com/agave-poisonous-85296.html • Are Hollyhocks Poisonous to Dogs? SF Gate, November 15, 2019.
https://homeguides.sfgate.com/hollyhocks-poisonous-dogs-82362.html • Plants for a Future, November 15, 2019.
https://pfaf.org/user/Plant.aspx?LatinName=Anagallis+arvensis • Bougainvillea Dangers, SF Gate, November 15, 2019.
https://homeguides.sfgate.com/bougainvillea-dangers-41076.html • Toxicology Brief: Cycad Toxicosis in Dogs, November 15, 2019.
http://veterinarymedicine.dvm360.com/toxicology-brief-cycad-toxicosis-dogs • Canadian Biodiversty Information, November 15, 2019.
https://www.cbif.gc.ca/eng/species-bank/canadian-poisonous-plants-information-system/all-plants-scientific-name/hedera-helix/?id=1370403266879 • Lantana Plant Safe For Toddlers, Reuters, November 15, 2019.
https://www.reuters.com/article/us-lantana-toddlers/lantana-plant-safe-for-toddlers-idUSTRE6A02MI20101101 • North Carolina Extension Gardener Plant Toolbox, November 18, 2019.
https://plants.ces.ncsu.edu/plants/artemisia/ • Biology, Ecology, and Management of Blueweed, Montana State University Extension, November 18, 2019. http://msuextension.org/publications/AgandNaturalResources/EB0195.pdf • Are Pyracantha Berries Poisonous? Poison Control National Capital Poison Center, November 20, 2019. https://www.poison.org/articles/are-pyracantha-berries-poisonous-183 • Dangerous Succulents: Photos and Descriptions of Succulent Varieties to use with Caution, July 12, 2020. https://debraleebaldwin.com/dangerous-succulents • American Veterinarian: Poison Potential of Succulents.
https://www.americanveterinarian.com/news/the-poison-potential-of-succulents • ASPCA: Animal Poison Control: https://www.aspca.org/pet-care/animal-poison-control • How Poisonous is Milkweed to Humans, San Francisco Gate, June 13, 2020. https://homeguides.sfgate.com/poisonous-milkweed-humans-74425.html | 
