Abortifacient and Reproductive Toxins 

Nitrate-Accumulating Plants                       

Ponderosa Pine Needles (Pinus ponderosa)

Nitrate Summary 

Broom Snakeweed (Gutierrezia sarothrae, microcephala)

Neurotoxic and Myotoxic Plants 

Cardiac Glycoside-Containing Plants 

Deathcamas (Zigadenus spp.) 

Hemp Dogbane (Apocynum cannabinum)

Larkspur (Delphinium spp.)

Locoweed (Astragalus, Oxytropis spp.)

Cyanide or Prussic Acid-Containing Plants 

Selenium Accumulators (Astragalus spp.)

Arrowgrass(Triglochin spp.)

Milkvetch (Astragalus spp.) 

Chokecherry (Prunus spp.)

Rayless Goldenrod (Haplopappus heterophyllus)

Lupine (Lupinus spp.) 

Gastrointestinal Irritants and Toxins 

Poison-hemlock (Conium maculatum)

Bitterweed (Hymenoxys odorata) 

Water Hemlock (Cicuta douglasii) 

Colorado Rubberweed or Pingue
(Hymenoxys richardsoni)

Western False Hellebore (Veratrum californicum)

Sneezeweed (Helenium hoopesii) 

Copperweed (Oxytenia acerosa)

Oxalate-Containing Plants

Greasewood (Sarcobatus vermiculatus)

Hepatotoxic and Pyrrolizidine
Alkaloid-Containing Plants 

Halogeton (Halogeton glomeratus)

Groundsel (Senecio riddellii,S. longilobus)

Tansy Ragwort (Senecio jacobaea)

Photosensitizing Plants

Horsebrush (Tetradymia glabrata, T. canescens)

St. Johnswort (Hypericum perforatum)

Spring Parsley (Cymopterus watsonii)