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

Plant Name  
Fagus sylvatica (European beech) More Info
Festuca elatior (Meadow Fescue) More Info
Festuca rubra (Red fescue) More Info
Ficus benjamina (Weeping banyan, Weeping fig) More Info
Ficus carica (Edible fig) More Info
Ficus pumila (Creeping fig) More Info
Foeniculum vulgare (Fennel) More Info
Fraxinus americana (White ash) More Info
Fraxinus excelsior (European ash) More Info
Fraxinus latifolia (Oregon ash) More Info
Fraxinus nigra (Black ash) More Info
Fraxinus pennsylvanica (Green ash, Red ash) More Info
Fraxinus velutina (Velvet ash, Arizona ash) More Info
Gaillardia pulchella (Blanket flower ) More Info
Gaussia (Maya palm, Llume palm, Gaussia, Opsiandra) More Info
Gelsemium sempervirens (Carolina jessamine, yellow jessamine) More Info
Ginkgo biloba (Maidenhair tree) More Info
Gladiolus x hortulanus (Gladiolus) More Info
Gossypium (Cotton) More Info
Grevillea robusta (Silk oak) More Info
Gypsophila paniculata (Baby's breath) More Info
Hedera canariensis (Algerian ivy) More Info
Hedera helix (English ivy) More Info
Helenium amarum (Sneezeweed) More Info
Helenium autumnale (Sneezeweed) More Info
Helianthus annuus (Common Sunflower) More Info
Heracleum (Cow parsnip) More Info
Hibiscus (Mallow, Rose mallow) More Info
Hippeastrum spp. and hybrids (Amaryllis) More Info
Hippomane mancinella (Machineel) More Info
Hippophae rhamnoides (Sea buckthorn) More Info
Holcus lanatus (Common velvetgrass) More Info
Hordeum vulgare (Common Barley) More Info
Humulus lupulus (Common Hop) More Info
Hura crepitans (Sandbox tree, Monkey pistol, Dynamite tree) More Info
Hyacinthus orientalis (Hyacinth) More Info
Hydrangea macrophylla (Hydrangea) More Info
Hymenocallis (Spider lilies.) More Info
Hymenoclea salsola (White cheesebush, Burrobrush) More Info
Hyophorbe lagenicaulis (Bottle palm) More Info
Hyophorbe verschaffeltii ( Spindle palm) More Info
Hypericum perforatum (St. John's wort, Klamath weed) More Info
Indigofera hirsuta (Hairy indigo) More Info
Ipomoea alba (Moonflower, Moon vine) More Info
Iris (Flag, Iris) More Info
Iva angustifolia (Narrow-leaf marsh elder) More Info
Iva annua (Rough marsh elder, Annual marsh elder) More Info
Iva axillaris (Poverty Weed, Deer root) More Info
Iva frutescens (Marsh elder, Coast elder, Jesuit's bark) More Info
Iva xanthifolia (Prairie ragweed) More Info
Jasminum officinale (Jasmine) More Info
Jatropha (Coral plants, Physic nuts) More Info
Juglans More Info
Juglans californica (California black walnut, Southern California walnut) More Info
Juglans cinerea (Butternut, White walnut) More Info
Juglans hindsii (Hind's walnut, California black walnut) More Info
Juglans microcarpa (Arizona walnut) More Info
Juglans nigra (Black walnut) More Info
Juglans regia (English walnut) More Info
Juniperus (Junipers, Red cedars) More Info
Juniperus ashei (Mountain cedar, Ashe's juniper) More Info
Juniperus californica (California juniper) More Info
Juniperus chinensis (Pfitzer (Juniper, Chinese)) More Info
Juniperus communis (Common Juniper) More Info
Juniperus monosperma (One-seed juniper) More Info
Juniperus occidentalis (Western juniper) More Info
Juniperus osteosperma (Utah juniper) More Info
Juniperus scopulorum (Rocky mountain juniper, Cedar) More Info
Juniperus virginiana (Eastern red cedar) More Info
Koeleria macrantha (Hairgrass) More Info
Krasheninnikovia lanata (Winterfat) More Info
Lactuca More Info
Lactuca sativa (Lettuce) More Info
Lactuca scariola (Prickly lettuce) More Info
Lantana camara (Lantana, Wild sage) More Info
Laportea canadensis (Stinging nettle, Canadian wood nettle) More Info
Larix occidentalis (Tamarack, Western larch) More Info
Leonotis nepetifolia (Lion's tail, Hollowstalk, Lion's ear) More Info
Leymus cinereus (Giant wild ryegrass, ) More Info
Leymus condensatus (Giant lyme grass) More Info
Leymus triticoides (Rye, wild ( alkali)) More Info
Liatris (Blazing star, Gay feather) More Info
Ligustrum japonicum (Japanese privet) More Info
Ligustrum lucidum (Shiny ligustrum, Glossy privet) More Info
Ligustrum vulgare (European privet) More Info
Lillum longiflorum (Lily, Easter) More Info
Liquidambar More Info
Liquidambar styraciflua (Sweet gum) More Info
Lobelia (Cardinal flower, Indian pink, lobelia) More Info
Lolium perenne (Perennial ryegrass) More Info
Lolium pratense (Meadow grass) More Info
Lycopodium clavatum (Running club moss) More Info
Maclura pomifera (Osage orange) More Info
Magnolia grandiflora (Southern magnolia.) More Info
Mangifera indica (Mango) More Info
Manilkara More Info
Manilkara zapota (Sapodilla) More Info
Mansoa alliacea (Garlic vine) More Info
Matricaria recutita (Wild chamomile) More Info
Medicago More Info

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