The nutritional makeup up a rabbit's complete diet is a large subject best explored here (Rabbit Nutrition: The Numbers). This is meant to be just a list of safe plants, along with a list of common but unsafe plants. Starred items I have personally fed my rabbits with no ill effects.
Grassy Types
Banana leaves*
Rye*
Bamboo*
Yellow Nutsedge*
Bahia*
Plantain*
Sunflower
Sorghum*
Pampas Grass*
Fountain Grass
Kenaf
Papyrus*
Papyrus*
Legume Types
Cowpea leaves*
Peanut leaves and shells*
Black Turtle bean leaves*
Green runner bean leaves*
Desmodium spp. leaves*
Herb Types
Spanish Needle (Bidens alba, Bidens pilosa)*
Soap Ginger*
Cardamom Ginger
Purslane*
Sweet potato leaves*
All Rosaceae family, including blackberry*, raspberry, pears*, and roses
Sycamore*
Maple*
Hibiscus*
Mulberry
Citrus leaves*
Persimmon leaves*
Canna leaves*
Squash spp.*
Carrot leaves*
Cilantro*
Rosemary
Basil
Parsley*
Lemongrass
Oregano
Sage
Prickly Pear (spines removed)
Pusley, Brazilian* and Floridian*
Violet Woodsorrel*
Palmetto*
Spanish Dagger*
Cabbage*
Spiderwort*
Loquat*
Palmetto*
Spanish Dagger*
Cabbage*
Spiderwort*
Loquat*
Unsafe but common plants
Crinum
Century plant
All Prunus species including Cherry Laurel (fruit may be safe, pits are not)
Chinaberry Tree
4 O'Clocks
Taro, Dasheen, Elephant Ear
Caladium
Amaryllis
Gladiolus
White Potato Greens
Oleander
Tomato plants
Crape Myrtle
Lantana
Privet
Frangipani
Rhoeo spathacea Steam (syn. R. discolor Hance)
Oyster plant
Moses-in-a-Boat (Purple Heart)
Rain lily
Asthma Weed, Spurge
Asthma Weed, Spurge
Unknown Toxicity Status
Heliconia
Ixora
Oak trees and acorns
Oak trees and acorns
Hydrangea
Ferns
Bromeliads
Cabbage Palm
Crepe Myrtle
Fig
Pine needles
Stargazer or Daylily
Kiwi
Muscadine grape
Orange Honeysuckle
Mexican Creeper
Passionflower
Magnolia
Allamanda
Confederate Jasmine
Wisteria
Dog Fennel
Liriope
Peace Lily
Periwinkle
Mexican Petunia
Air Potato, Diascorea spp.
Mimosa
Acacia spp.
Begonia spp.
Cypress spp.
Pecan leaves
Prickly sida, Sida spinosa
Monkey Ear Tree leaves
Monkey Ear Tree leaves
Here is a quick list of some rabbit-safe forages from Hawaii. It may give some ideas to those who live in South Florida.
Kiawe (mesquite)
Mulberry
Plantain (the small green lawn weed type as well as the banana types of plantain)
Sweet potato vines
Sunflower - seeds, leaves and stems
Grape vines and leaves
Rosemary (it is said rosemary will make their wool lustrous, however they won't always eat it.)
Basil
Lemon balm
Daikon
Banana - leaves, skins, fruit and trunk
Corn - husks, leaves and stems - not too much of the grain, though.
Roses - leaves, flowers and stems
Beet greens - not too much of the root, but you are supposed to eat that yourself.
Pigeon Pea - leaves and pods
Russian olive - although they may not like the taste
Ti leaves
Guinea grass - although they prefer the young leaves to the old stickery ones.
Dandelions
Carrots, especially the green tops
Nasturiums
Parsley
Alfalfa
Clover
Rabbits turn weeds into fertilizer, just think of the possibilities...