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Wisteria, laburnum, coral trees, hyacinth beans - there are many legumes that are highly toxic.
The 'edible' nightshades: tomato, potato, eggplants, tomatillos, peppers, pepino, cape gooseberries, lulo and others all have poisonous parts. Potatoes above-ground parts, especially the fruit, are something you really, really do not want to ingest. The same family of plants includes datura/jimson weed, brugmansias, tobacco, petunias, and belladonna, none of which you want to ingest; datura, brugs and belladonna can kill you quickly.
The carrot family includes poison hemlock and hogweed which are likewise extremely toxic. Both can be absorbed through the skin.
For those in tropical locales - mango and cashew trees (which belong to the sumac family, and are distant relatives of poison ivy and poison oak) have toxic parts as well, cashews especially.