Oak, Bear (see Oak, Scrub) Oak, Black Quercus velutina Beech Oak, Chestnut Quercus prinus Beech Oak, Chestnut-leaved (see Oak, Chestnut) Oak, Gray (see Oak, Red) Oak, Northern Red (see Oak, Red) Oak, Peach (see Oak, Willow) Oak, Pin Quercus palustris Beech Oak, Quercitron (see Oak, Black) Oak, Red Quercus rubra Beech Oak, Rock (see Oak, Chestnut) Oak, Rock Chestnut (see Oak, Chestnut) Oak, Scrub Quercus ilicifolia Beech Oak, Spanish (see Oak, Pin) Oak, Stave (see Oak, White) Oak, Swamp (see Oak, Pin) Oak, White Quercus alba Beech Oak, Willow Quercus phellos Beech Oak, Yellow (see Oak, Black) Oats, Wild/ Sessile Bellwort/ Little Merrybells Uvularia sessilifolia Lily Obediant plant Physostegia virginiana Mint Oilnut (see Butternut) Old Man's Beard (see Virgin's Bower/ Old Man's Beard) Oleaster, Autumn (see Olive, Autumn) Olive, Autumn Eleagnus umbellata Oleaster/Eleagnus Onion, Nodding Wild Allium cernuum Lily Orach Atriplex patula Goosefoot Orange mock oyster (see Nestcap) Orchid, Rattlesnake Goodyera pubescens Orchid Osage orange Maclura pomifera Mulberry Oswego Tea (see Bee-balm/ Oswego tea) Ox-Eye/ False Sunflower Heliopsis helianthoides Sunflower-Like Oyster, bitter (see Panellus, luminescent) Oyster, green (see Oyster, late) Oyster, late Panella seratinus Fungus Oyster, late fall (see Oyster, late)

Oleaster/Eleagnus Olive, Autumn Eleagnus umbellata Olive Ash, White Fraxinus americana Olive Forsythia Forsythia suspensa Olive Lilac Syringa vulgaris Olive Privit Ligustrum vulgare Olive Privit, border Ligustrum obtusifolium Olive Privit, regel Orchid Ladies'-Tresses, Nodding/ Common Ladies' Tresses Spiranthes cernua Orchid Lady's-Slipper, Pink/ Moccasin-Flower Cypripedum acaule Orchid Orchid, Rattlesnake Goodyera pubescens