Here are places to look. I don't know what umbrella grass is. There certainly are exceptions, but mostly a person (even a small child) has to eat a fair amount of something to get the toxic effects, and mostly the toxic plants taste bad enough that the person/child wouldn't want to eat that much of it.

http://www.thegardenhelper.com/toxichouse.htm
http://www.blankees.com/house/plants/poisonous.htm
http://www.denverplants.com/foliage/html/Poisonous_Plants.htm

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may God bless the WHOLE world!