Piper, G.L.

Found in all areas of the Pacific Northwest, meadow deathcamas (Toxicoscordion venenosum) is capable of killing livestock whether eaten as forage or in dried hay. Human poisonings have been reported i ...

Western waterhemlock (Cicuta douglasii) is the most poisonous plant in North America. This publication provides identifiers to assist in avoiding the toxic plant, including ways to distinguish it from ...

Yellow toadflax and Dalmatian toadflax are non-native plants that have become two of the most troublesome invasive weeds in North America.