The following is a collective list of Allergenic plants with supporting information.

Plant Name  
Centaurea maculosa (Knapweed) More Info
Ceratonia siliqua (Carob (algarroba), St. John's bread) More Info
Cercidium More Info
Cestrum nocturnum (Night blooming jessamine) More Info
Chamaecyparis lawsoniana (Port Orford cedar, Lawson's cypress) More Info
Chamaecyparis nootkatensis (Alaska cedar) More Info
Chamaecyparis obtusa (Hinoki white cypress) More Info
Chamaecyparis thyoides (Atlantic white cedar) More Info
Chamaedorea (Parlor palm, Bamboo palm, Reed palm) More Info
Chamaenerion angustifolium (Fireweed) More Info
Chamaerops humilis (Palm, Dwarf) More Info
Chamaesyce hirta (Spurge) More Info
Chamaesyce hyssopifolia (Spurge) More Info
Chelidonium majus (Celandine) More Info
Chenopodium album (Lamb's quarters) More Info
Chenopodium ambrosioides (Mexican tea) More Info
Chenopodium berlandieri (Pit seed goosefoot) More Info
Chenopodium botrys (Jerusalem oak) More Info
Chimaphila umbellata (Prince's pine, Pipsissewa) More Info
Chionanthus virginicus (Fringe tree, Old man's beard) More Info
Chrysanthemum (Chrysanthemum, Crown daisy, Corn marigold) More Info
Chrysanthemum leucanthemum (Daisy, Ox-Eye) More Info
Chrysanthemum x morifolium (Florist's chrysanthemum) More Info
Chrysothamnus viscidiflorus (Douglas rabbitbush, Green rabbitbrush) More Info
Cichorium intybus (Chicory) More Info
Cinnamomum camphora (Camphor tree) More Info
Citrus (Citrus trees (orange, lemon, lime, grapefruit, etc.)) More Info
Citrus sinensis (Sweet orange) More Info
Clematis spp. and hybrids (Virgin's bower) More Info
Cleome spinosa (Spider flower) More Info
Cnidoscolus stimulosus (Spurge nettle, Bull nettle, Stinging nettle) More Info
Cocos nucifera (Coconut palm) More Info
Codiaeum variegatum (Croton) More Info
Colocasia esculenta (Taro, Elephant ear, Dasheen) More Info
Comptonia peregrina (Sweet fern) More Info
Conium maculatum (Poison hemlock) More Info
Conyza canadensis (Butterweed, horseweed) More Info
Coriandrum sativum (Coriander) More Info
Cortaderia selloana (Uruguayan pampasgrass) More Info
Corylus americana (American hazelnut) More Info
Corylus cornuta (Beaked hazelnut) More Info
Cosmos bipinnatus (Garden cosmos) More Info
Crataegus crus-galli (Cockspur hawthorn) More Info
Croton (Crotons) More Info
Cryptomeria japonica (Japanese cedar) More Info
Cryptostegia grandiflora (Palay rubbervine,Pink allamanda) More Info
Cryptostegia madagascariensis (Madagascar rubbervine, Purple allamanda) More Info
Cupressus arizonica (Arizona cypress) More Info
Cupressus macrocarpa (Monterey cypress) More Info
Cupressus sempervirens (Italian cypress) More Info
Cycas (Sago palms) More Info
Cymbidium (Cymbidium orchids) More Info
Cymbopogon citratus (Lemongrass) More Info
Cynodon dactylon (Bermudagrass) More Info
Cynoglossum (Hound's tongue, Wild comfrey) More Info
Cyperus (Sedges, papyrus) More Info
Cyperus esculentus (Yellow nut sedge, chufa) More Info
Cypripedium (Lady slipper orchids, Moccasin flower) More Info
Cytisus scoparius (Scotch broom) More Info
Dactylis glomerata (Orchardgrass) More Info
Dalbergia More Info
Daphne (Daphne) More Info
Datura metel (Thorn apple, Datura) More Info
Datura stramonium (Jimson weed, Thorn apple, Datura) More Info
Daucus carota (Wild carrot, Queen Anne's lace) More Info
Delphinium (Larkspur, Staggerweed) More Info
Dianthus caryophyllus (Carnation) More Info
Dicentra (Bleeding heart) More Info
Dicoria canescens (Silver ragweed) More Info
Dictamnus albus (Gas plant, Dittany, Burning bush) More Info
Dieffenbachia spp. and hybrids (Dumb-cane) More Info
Digitaria (Crabgrass) More Info
Dioscorea (Yams) More Info
Dirca palustris (Leather bark, Wicopy, Swamp wood) More Info
Distichlis spicata (Coastal saltgrass) More Info
Echium plantagineum (Paterson's curse, Salvation Jane) More Info
Elaeagnus angustifolia (Russian olive) More Info
Elymus More Info
Elymus repens (Quack grass, Couch grass) More Info
Epipremnum aureum (Pothos) More Info
Equistetum hyemale (Horsetail, Scouring-rush) More Info
Erythrina herbacea (Cardinal spear, Cherokee bean, Eastern Coral bean, Snakeweed) More Info
Erythrina poeppigiana (Mountain immortelle) More Info
Erythrina variegata (Coral tree, Lenten tree, Tiger's claw) More Info
Eschscholtzia californica (California poppy) More Info
Eucalyptus (Gum trees) More Info
Eucalyptus globulus (Tasmanian blue gum) More Info
Eupatorium capillifolium (Dog fennel) More Info
Euphorbia (Spurges, Milk cacti) More Info
Euphorbia cotinifolia (Red Spurge ) More Info
Euphorbia cyathophora (Painted leaf) More Info
Euphorbia fulgens (Scarlet plume) More Info
Euphorbia heterophylla (Painted leaf) More Info
Euphorbia lactea (Milky spurge, Spurge cactus, Candelabra cactus, Brain cactus (var. cristata)) More Info
Euphorbia milii (Crown-of-thorns) More Info
Euphorbia pulcherrima (Poinsettia) More Info
Euphorbia tirucalli (Pencil tree, Milk bush, Spurge tree) More Info
Evonymus spp (Burning bush, Strawberry bush, Hearts-a-bustin', Spindle tree, Wahoo) More Info
Fagopyrum esculentum (Buckwheat) More Info
Fagus grandifolia (American beech) More Info

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