This page was last updated on: January 10, 2008
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Some of the plants known to be toxic to sheep are:
Apple Seeds - Poisonous, especially the green seeds
Azalea - Toxicity
Beet Tops
Black Henbane (Hyoscyamus niger)
Black Nightshade (Solanum nigrum)
Buckwheat (Tagopyrum sagittatum)
Broadleaf Milkweed
Chokeberry - Poisonous,especially in the spring
Colorado Rubberweed
Curly Leafed Dock (Rumex crispus)
Deadly Nightshade (Atropa belladona)
Death Camas (Zigadenus spp.)  Poisonous,especially in the spring
Fitweed (Corydalis casearra)
Goldenrod (Solidago spp.)
Greasewood (Sarcobatus vermiculatus)
Horsebush (Tetradymia spp.) - Poisonous,especially in the spring
Horse Nettle (Solanum eleagnifolium)
Jimson Weed (Datura stramonium)
Kochia (Kochia scoparia)
Lamb's Quarters (Chenopodium album)
Lantana (Lantana spp.)
Larkspur - Poisonous during some seasons -- dangerous  (sheep like it)
Locoweed (Oxytropis spp., Astragalus spp.)
Lupine (Lupinus spp.)  - Poisonous,especially in the summer and fall
Milk Thistle
Milkweed - Poisonous,especially in the summer
Mountain Laurel - Toxicity
Night Shade - Poisonous to animals and humans (goats like it)
Oaks - Quercus species   acorns can cause kidney damage
Oxalis (Oxalis spp.)
Paper Flowers (Psilotrope spp.)
Pigweed (Amaranthus spp.)
Poison or Spotted Hemlock (Conium maculatum)
Potato Sprouts - May cause Birth Defects
Red Maple Leaves - can cause kidney damage
Red Sorrel
Rhododendron - Toxicity
Rhubarb (Rheum rhaponticum)
Rosary Pea - Precatory-pea (Abrus precatorius)
Sacahuiste (Nolina texana)
Skunk Cabbage (Veratrum californicum) - May cause Birth Defects
Snakeroot (Eupatorium rugosum)
Spring Parsley (Cymopterus watsoni)
St. Johnswort (Hypericum perforatum)
Tansy Ragwort
Threadleaf Snakeweed
Water Hemlock (Cicuta Spp.)
Western Whorled Milkweed
Wild tobacco stalks - May cause Birth Defects
Yew Needles - Extreme Toxicity
All areas of North America are host to some poisonous plants. 
The good news is that animal usually don't chow down on these plants, unless they are very hungry.  But sometimes an individual animal will start eating a poisonous plant even if there's plent of good feed available.
Check with your county Extension agent to learn which plants in your area are
poisonous to sheep.