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

Plant Name  
Populus sargentii (Cottonwood, Western) More Info
Populus tremuloides (Quaking aspen) More Info
Populus wislizenii (Cottonwood, Rio Grande) More Info
Primula malacoides (Fairy primrose) More Info
Primula obconica (Primrose) More Info
Prosopis More Info
Prosopis glandulosa (Honey mesquite) More Info
Prunus More Info
Prunus armeniaca (Apricot) More Info
Prunus cerasus (Sour cherry) More Info
Prunus domestica (Plum (prune), European plum) More Info
Prunus dulcis (Sweet almond) More Info
Prunus persica (Peach) More Info
Pseudogynoxys chenopodioides (Mexican flame vine) More Info
Pseudoroegneria spicata (Bluebunch wheatgrass) More Info
Pseudotsuga menziesii (Douglas fir) More Info
Pteridum aquilinum (Bracken fern) More Info
Pterocarya fraxinifolia (Wingnut) More Info
Ptychosperma ( Macarthur palm, Ptychosperma, Solitaire) More Info
Pyrus communis (Common Pear) More Info
Quercus (Oaks) More Info
Quercus agrifolia (Coastal live oak) More Info
Quercus alba (Northern white oak) More Info
Quercus bicolor (Blue oak, Swamp white oak) More Info
Quercus chrysolepsis (Canyon live oak) More Info
Quercus dumosa (Coastal sage scrub oak) More Info
Quercus engelmannii (Engelmann's oak) More Info
Quercus falcata (Southern red oak) More Info
Quercus gambelii (Gambel's oak) More Info
Quercus garryana (Garry oak, Oregon white oak) More Info
Quercus ilex (Oak, holly) More Info
Quercus kelloggii (California black oak) More Info
Quercus laurifolia (Laurel oak) More Info
Quercus lobata (Valley oak) More Info
Quercus macrocarpa (Burr oak) More Info
Quercus marilandica (Blackjack oak) More Info
Quercus nigra (Water oak) More Info
Quercus palustris (Swamp oak, Pin oak) More Info
Quercus phellos (Willow oak) More Info
Quercus rubra (Northern red oak) More Info
Quercus stellata (Post oak) More Info
Quercus velutina (Black oak) More Info
Quercus virginiana (Live oak) More Info
Quercus wislizeni (Interior live oak) More Info
Ranunculus (Buttercups, Crowfoots) More Info
Raphanus sativus (Radish) More Info
Rhabdadenia biflora (Rubbervine) More Info
Rheum rhabarbarum (Rhubarb) More Info
Rhoeo spathacea (Oyster plant, Moses-in-a-cradle) More Info
Rhus (Sumacs) More Info
Ricinus communis (Castor bean) More Info
Robinia pseudoacacia (Black locust) More Info
Rosa (Rose) More Info
Rosa multiflora (Rambler rose) More Info
Rosmarinus officinalis (Rosemary) More Info
Roystonea regia (Royal palm) More Info
Rudbeckia hirta (Black-eyed susan) More Info
Rumex acetosa (Garden sorrel) More Info
Rumex acetosella (Red sorrel, Common Sheep sorrel) More Info
Rumex crispus (Curly dock) More Info
Rumex obtusifolius (Bitter dock) More Info
Rumex orbiculatus (Greater water dock) More Info
Ruta graveolens (Rue) More Info
Saccharum officinarum (Sugar cane) More Info
Salicornia virginica (Pickleweed) More Info
Salix (Willows) More Info
Salix caprea (Sallow, Goat willow) More Info
Salix caroliniana (Coastal plain willow) More Info
Salix discolor (Pussy willow) More Info
Salix laevigata (Red willow, Polished willow) More Info
Salix lasiolepis (Arroyo willow) More Info
Salix lucida (Yellow willow) More Info
Salix nigra (Black willow) More Info
Salsola kali (Russian thistle) More Info
Sambucus nigra (Elderberry) More Info
Sanguinaria canadensis (Bloodroot) More Info
Sapindus saponaria (Soapberry) More Info
Sapium sebiferum (Chinese tallow tree, popcorn tree) More Info
Sarcobatus vermiculatus (Greasewood) More Info
Sarcocornia perennis (Pickleweed) More Info
Sassafras albidum (Sassafras) More Info
Schefflera actinophylla (Umbrella tree) More Info
Schinus molle (Pepper Tree) More Info
Schinus terebinthifolius (Brazilian peppertree, Florida holly) More Info
Scirpus (Bulrushes) More Info
Scirpus validus (Bulrush) More Info
Secale cereale (Cultivated Rye) More Info
Senecio (Groundsels) More Info
Senecio glabellus (Butterweed) More Info
Senna siamea (Siamese shower tree) More Info
Sequoia sempervirens (Redwood) More Info
Shepherdia argentea (Silver buffalo berry) More Info
Solandra (Chalice vines, Cup of gold) More Info
Solidago (Goldenrods) More Info
Solidago canadensis (Canadian goldenrod) More Info
Solidago gigantea (Late goldenrod) More Info
Solidago multiradiata (Goldenrod) More Info
Sorghastrum nutans (Yellow Indian grass) More Info
Sorghum bicolor (Sorghum, Sudan grass (subsp, drummondii]) More Info
Sorghum halepense (Johnsongrass) More Info

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