If so, here are resources you might be looking for:
Sources
Deadly Doses: a Writer’s Guide to Poisons by Serita Deborah Stevens
Magic and Medicine of Plants, Reader’s Digest Books
The Complete Medicinal Herbal, Penelope Ody
Pretty Poisonous Plants Lurking in Your Garden
Remember: "toxic" doesn't always = lethal. It all depends on the dose and the person.
Extremely Toxic:
* Belladonna (nightshade)
* Hemlock (Conium maculatum)
* Lily of the Valley (Convallaria majalis)
* Monkshood (Aconitum napellus)
* Rhododendron, Azalea
* Savin Juniper (Juniperus sabina)
* Yews (Taxus species)
Very Toxic:
* Elderberry (Sambucus canadensis)
* Rhubarb (Rheum rhaponticum)
* Foxglove (Digitalis purpurea)
* Tansy (Tanacetum vulgare)
* Hydrangea (Hydrangea macrophylla)
* Horse chestnut [buckeye] (Aesculus hippocastanum)
* Potato (Solanum tuberoscum)
* Narcissus (Narcissus poeticus)
Toxic:
* Bloodroot (Sanguinaria canadensis)
* Larkspur (Delphinium consolida)
* Poinsettia (Euphorbia pulcherrima)
* Mistletoe: whole plant is toxic, especially the berries; does not cause death
Others
* Bird's-foot Trefoil (Lotus corniculatus)
* Black Cohosh (Cimicifuga racemosa) [Bugbane)
* Black Locust (Robinia pseudoacacia)
* Black Mustard (Brassica nigra)
* Bouncing Bet (Saponaria officinalis) [Soapwort]
* Boxwood (Buxus sempervirens)
* Broom (Cytisus scoparius)
* Butterfly Weed (Asclepias tuberose)
* Button Snakeroot (Eryngium yuccifolium)
* Chinese Lantern (Ground cherries) (Pysalis alkekengi) [unripe fruits may be toxic)
* Hedge mustard (Sisymbrium officinale)
* Highbush Cranberry (Viburnum opulus) [berries]
* Lady's Slipper (Cypripedium calceolus)
* Milkweed (Asclepias syriaca) [roots]
* Rue (Ruta graveolens)
* Sorrel (Rumex acetosa)
The Iowa Poison Control Center http:// http://www.iowapoison.org/ 1.800.222.1222
Questions? Email me: jaye@jayellwilson.com
Thanks! --- Jean
