Introduced Plants of the U.S. Click on an accepted name below to view its Plant Profile with all synonyms, distribution map, more information, and web links if available.

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Symbol Scientific Name Common Name LULU3 Luzula luzuloides (Lam.) Dandy & Wilmott oakforest woodrush PEPA52 Pelargonium panduriforme Ecklon & Zeyh. oakleaf garden geranium PEQU5 Pelargonium quercifolium (L. f.) L'Hér. ex Ait. oakleaf geranium CHGL3 Chenopodium glaucum L. oakleaf goosefoot SOHY3 Sorbus hybrida L. oakleaf mountain ash ATOB2 Atriplex oblongifolia Waldst. & Kit. oblongleaf orache IPOB Ipomoea obscura (L.) Ker-Gawl. obscure morning-glory IPIN Ipomoea indica (Burm. f.) Merr. oceanblue morning-glory SCAC2 Schefflera actinophylla (Endl.) H.A.T. Harms octopus tree ELRU2 Eleutheranthera ruderalis (Sw.) Schultz-Bip. ogiera† DILI8 Dipogon lignosus (L.) Verdc. okie bean ABES Abelmoschus esculentus (L.) Moench okra CYCY Cyperus cyperinus (Retz.) Sur. Old World flatsedge SEVU Senecio vulgaris L. old-man-in-the-Spring WEFL2 Weigela florida (Bunge) A. DC. oldfashioned weigela GYOL Gypsophila oldhamiana Miq. Oldham's babysbreath GIPH Gisekia pharnacioides L. oldmaid POCO30 Polycarpaea corymbosa (L.) Lam. oldman's cap NEOL Nerium oleander L. oleander OLEU Olea europaea L. olive IMOL Impatiens oliveri C. Wright ex W. Wats. Oliver's touch-me-not VIAR81 Vicia articulata Hornem. oneflower vetch ROMI3 Rorippa microphylla (Boenn. ex Reichenb.) Hyl. ex A.& D. Löve onerow yellowcress CRMO3 Crataegus monogyna Jacq. oneseed hawthorn GASE3 Galenia secunda (L. f.) Sonder onesided galenia ASFI2 Asphodelus fistulosus L. onionweed TRMI10 Tragopogon mirabilis Rouy Ontario goatsbeard PASO2 Papaver somniferum L. opium poppy SASO3 Salsola soda L. oppositeleaf Russian thistle COFR3 Cotoneaster franchetii Boiss. orange cotoneaster HEFU Hemerocallis fulva (L.) L. orange daylily BUDA2 Buddleja davidii Franch. orange eye butterflybush HIAU Hieracium aurantiacum L. orange hawkweed CEAU2 Cestrum aurantiacum Lindl. orange jessamine LIBU Lilium bulbiferum L. orange lily VEPH Verbascum phlomoides L. orange mullein SEKA Sedum kamtschaticum Fisch. & C.A. Mey. orange stonecrop SEKAE Sedum kamtschaticum Fisch. & C.A. Mey. ssp. ellacombianum (Praeger) Clausen orange stonecrop ACSA Acacia saligna (Labill.) Wendl. f. orange wattle SOLA Solanum lanceolatum Cav. orangeberry nightshade DAGL Dactylis glomerata L. orchardgrass DAGLG Dactylis glomerata L. ssp. glomerata orchardgrass ORVU Origanum vulgare L. oregano PLOR80 Platycladus orientalis (L.) Franco oriental arborvitae ASOR6 Asperula orientalis Boiss. & Hohen. oriental asperula RARUO Rapistrum rugosum (L.) All. ssp. orientale (L.) Arcang. oriental bastardcabbage YOJA Youngia japonica (L.) DC. oriental false hawksbeard EROR7 Eremopyrum orientale (L.) Jaubert & Spach oriental false wheatgrass TEOR Teucrium orientale L. oriental germander COOR4 Consolida orientalis (J. Gay) Schroedinger oriental knight's-spur POCA49 Polygonum caespitosum Blume oriental ladysthumb‡ POCAC4 Polygonum caespitosum Blume var. ?caespitosum oriental ladysthumb EUESO Euphorbia esula L. var. orientalis Boiss. oriental leafy spurge LEFO3 Lespedeza formosa (Vogel) Koehne oriental lespedeza BRGY Bruguiera gymnorrhiza (L.) Lam. oriental mangrove EDPA Edgeworthia papyrifera Sieb. & Zucc. oriental paperbush PHVI81 Photinia villosa (Thunb.) DC. oriental photinia PAOR5 Papaver orientale L. oriental poppy TROR Trema orientale (L.) Blume oriental trema ANEV Angiopteris evecta (J.R. Forst.) Hoffmann oriental vessel fern CLOR Clematis orientalis L. oriental virginsbower IMGL Impatiens glandulifera Royle ornamental jewelweed FOMA2 Fortunella margarita (Lour.) Swingle oval kumquat SPLA11 Spermacoce latifolia Aubl. oval-leaf false buttonweed POAR11 Polygonum arenastrum Jord. ex Boreau oval-leaf knotweed AEGE Aegilops geniculata Roth ovate goatgrass GASP9 Gamochaeta sphacilata (Kunth) Cabrera owl's crown LEVU Leucanthemum vulgare Lam. oxeye daisy SESQ Senecio squalidus L. oxford ragwort

† Probably introduced to the U.S.

‡ Some populations in the U.S. are native and others are introduced from other countries

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