There are hundreds of plants that are toxic to cats. The most comprehensive
list of them is found at :

http://maxshouse.com/ToxicPlantsComplete.htm
http://maxshouse.com/Toxic_Plants%20_Index.htm

Also, from booklet entitled 'Cat Care Guide; A Lifetime of Wellness',
published by Purina.
Plants that are poisonous to cats :

amarylis
buckeye
clematis
cyclamen
daphne
foxglove
iris
lilies (all types)
morning glory
oleander
poinsettia
rhododendron
weeping fig
azalea
castor bean
corn plant
daffodil
dumb cane (all types)
holly
ivy (most types)
mistletoe
philodendron (all types)
precatory bean
yew