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Scientific Name Common Name(s) Plant Category Image
Nymphaea 'Texas Dawn' Texas Dawn Water Garden
Nymphaea 'Tina' Tina Water Garden
Nymphaea 'Venus' Venus Water Garden
Nymphaea 'Virginalis' Virginalis Water Garden
Nymphaea 'Virginia' Virginia Water Garden
Nymphaea 'William Falconer' William Falconer Water Garden
Nymphaea 'Yellow Dazzler' Yellow Dazzler Water Garden
Nymphaea colorata Blue Pigmy, Colorata Water Garden
Nymphaea x marliacea 'Carnea' Carnea Water Garden
Nymphaea x marliacea 'Chromatella' Chromatella Water Garden
Nymphoides pelatum Floating heart Water Garden
Nyssa aquatica Water tupelo Trees
Nyssa ogeche Ogeechee lime, Ogeechee tupelo Trees
Nyssa sinensis Chinese tupelo Trees
Nyssa sylvatica Black gum, Black tupelo, Sour gum Native Plants, Trees
Ocimum basilicum Sweet basil Edible Plants, Herbs
Odontonema strictum Firespike Annuals
Oenothera biennis Evening primrose Perennials, Wildflowers
Oenothera fruticosa Sundrops Herbs, Native Plants, Perennials, Wildflowers
Oenothera speciosa Showy evening primrose Perennials
Oenothera tetragona Sundrops Perennials, Wildflowers
Omphalodes linifolia Navelwort Annuals
Omphalotus olearius (Clitocybe illudens) Jack-O-Lantern Poisonous Plants
Onoclea sensibilis Bead fern, Sensitive fern Ferns, Native Plants
Ophiopogon jaburan vittata Snakebeard, White lilyturf Groundcover
Ophiopogon japonicus Mondo grass Groundcover
Ophiopogon japonicus 'Nana' Dwarf mondo grass Groundcover
Opuntia humifusa Eastern prickly pear cactus Native Plants, Perennials
Opuntia spp. Rabbit ears cactus, prickly pear cactus Native Plants, Poisonous Plants
Origanum laevigatum Ornamental oregano Herbs, Perennials
Origanum majorana Sweet marjoram Edible Plants, Herbs
Origanum vulgare Oregano Edible Plants, Herbs
Ornithogalum Star of Bethlehem Summer Bulbs
Ornithogalum umbellatum Star of Bethlehem Perennial Bulbs, Spring Bulbs
Ornithogalum umbellatum, O. thrysoides Ornithogalum, Star-of-Bethlehem Poisonous Plants
Orontium aquaticum Golden club Poisonous Plants, Water Garden, Wildflowers
Osmanthus americanus Devilwood, Wild olive Native Plants, Shrubs, Trees
Osmanthus delavayi Delavay teaolive Shrubs
Osmanthus fragrans Fragrant tea olive, Sweet osmanthus Shrubs
Osmanthus heterophyllus False holly, Holly osmanthus, Holly tea olive Shrubs
Osmanthus x burkwoodii Burkwood osmanthus Shrubs
Osmanthus x fortunei Fortune's osmanthus, Fortune's tea olive Shrubs
Osmunda cinnamomea Cinnamon fern Ferns, Native Plants
Osmunda claytoniana Clayton's fern, Interrupted fern Ferns
Osmunda regalis Flowering fern, Royal fern Ferns, Native Plants
Ostrya virginiana Eastern hop hornbeam, Hop horn beam, Hop hornbeam Native Plants, Trees
Oxalis Clover, Good luck plant, Lucky clover, Oxalis, Shamrock, Wood-sorrel Annuals, Perennials, Poisonous Plants, Summer Bulbs, Wildflowers
Oxalis corniculata L. Creeping woodsorrel Annuals, Perennials, Wildflowers
Oxalis crassipes Oxalis Perennials, Poisonous Plants
Oxalis grandis Large yellow wood-sorrel, Oxalis, Sourgrass Poisonous Plants, Wildflowers