For more comprehensive lists (like, really extensive), consult www.ASPCA.org for printable lists.
Plants Non-Toxic to Cats
African Violet
Aluminum Plant (Watermelon Plant)
American Rubber Plant
Areca Palm
Artillery Plant
Norfolk Island Pine
Bamboo
Bamboo Palm
Banana
Basil
Rex Begonia
Begonia, Trailing
Boston Fern
Bottle Palm (Elephant-foot Tree, Pony Tail Plant)
Burro's Tail (Donkey's Tail)
Calathea
Cast Iron Plant
Chamaedorea/Parlor Palm
Chenille Plant
Chicken-Gizzard/Irisine
Christmas Cactus
Dracaena (Song of India, Pleomele)
Emerald Ripple Peperomia
Fish Tail Fern
Friendship Plant
Gold-Fish Plant
Golden Butterfly Palm (Areca Palm)
Dwarf Palm, Parlor Palm/Chamaedorea elegans
Hare Fern (Rabbit's Foot Fern)
Haworthia
Hens and Chickens
Hindu Rope Plant/Hoya carnosa 'krinkle kurl'
Hoya carnosa
Jasmine
Lipstick Plant
Living Stones/Lithops
Majesty Palm
Manila Palm (Christmas Palm)
Maranta
Metallic Peperomia/ Peperomia caperata
Mosaic Plant (Nerve Plant)
Nasturtium
Neanthe Bella Palm (Neanthebella)
Peperomia Rotundifolia
Phalaenopsis Orchid
Pilea Microphylla (Artillery Plant)
Polka Dot Plant/Hypoestes
Prayer Plant (Maranta)
Purple Passion Vine
Pygmy Date Palm (Robellini Palm)
Rosemary
Spider Plant (Ribbon Plant)
Staghorn Fern
Sunflower
Swedish Ivy (Creeping Charlie)
Sweet Potato Vine
Sweetheart Hoya (wax hearts, valentine hoya)
Venus Fly Trap
Watermelon Peperomia
Watermelon Pilea (Aluminum Plant)
Wax Plant (Hindu Rope Plant)
Plants Non-Toxic to Dogs
African Violet
Aluminum Plant (Watermelon Plant)
Areca Palm
Artillery Plant
Australian Pine (Norfolk Pine, House Pine, Norfolk Island Pine)
Bamboo (Golden Bamboo, Fishpole Bamboo)
Bamboo Palm (Parlor Palm) : Chamaedorea elegans
Banana (Plantain)
Basil
Begonia, Climbing (Rex Begonia)
Begonia, Trailing (Trailing Watermelon Begonia
Boston Fern
Bottle Palm (Elephant-foot Tree, Pony Tail Plant)
Burro's Tail (Horse's Tail, Donkey's Tail, Lamb's Tail)
Calathea
Cast Iron Plant
Cattleya Labiata
Chamaedorea
Chenille Plant
Chicken-Gizzard/Iresine
Echeveria elegans
Christmas Cactus
Christmas Palm Manila Palm)
Emerald Ripple Peperomia
Fish Tail
Friendship Plant
Gold-Fish Plant
Golden Butterfly Palm (Areca Palm, Cane Palm, Golden Feather Palm, Yellow Palm)
Hare Fern (Rabbit's Foot Fern)
Haworthia (Many cultivars
Hens and Chickens
Hindu Rope Plant / Hoya carnosa 'krinkle kurl'
Lipstick
Living Stones/ Lithops
Majesty Palm
Malaysian Dracaena (Song of India, Pleomele)
Maranta
Miniature Date Palm (Pygmy Date Palm, Robellini Palm)
Mosaic Plant ( Nerve Plant)
Nasturtium
Neanthe Bella Palm
Nerve Plant ( Mosaic Plant) Fittonia
Phalaenopsis Orchid
Pilea Microphylla (Artillery Plant)
Pink Splash (Polka Dot Plant Hypoestes
Prayer Plant (Maranta, )
Purple Passion Vine
Rosemary
Spider Plant (Ribbon Plant, Anthericum, Spider Ivy
Sunflower
Swedish Ivy (Creeping Charlie)
Sweet Potato Vine (Sweet potato)
Sweetheart Hoya (wax hearts, valentine hoya) Hoya kerrii
Venus Fly Trap
Watermelon Peperomia (Watermelon Begonia)
Watermelon Pilea (Watermelon Plant, Aluminum Plant)
Wax Plant (Hindu Rope Plant, Porcelain Flower)
ASPCA: Mildly Toxic Plants
Fiddle Leaf Fig
Spider Plant
Pothos or Devil’s Ivy
Dumbcane (Dieffenbachia)
Peace Lily
Philodendron
Calla Lily
Chinese Evergreen
ASPCA: Moderately Toxic Plants
Corn Plant
Dragon Tree (Dracaena spp)
Jade Plant
ASPCA: Severely Toxic Plants
Sago Palm (Cycas revoluta)
Easter Lily