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Opuntia phaeacantha

Brown-spine Prickly Pear Cactus, Dark-spined pricklypear, Desert Prickly Pear, New Mexico Prickly Pear, Purple-fruit Prickly Pear, Tulip Prickly Pear, Tulip Prickly-Pear
Flower Flower Form Form Flowers Flowers Form in May Form in May
3 Cultivars/Varieties

Orbea variegata

Carrion Cactus, Carrion Flower, Starfish Cactus, Starfish Flower, Toad Cactus, Toad Plant, Toad Spotted Cactus
Flower Flower Flower close up Flower close up Form Form Opening flower Opening flower Flower Flower Form Form

Origanum

Oregano
Form Form Form in bloom Form in bloom Close up of flower Close up of flower Butterfly on flowers Butterfly on flowers Close up of leaves Close up of leaves Leaves Leaves
1 Cultivar/Variety

Origanum laevigatum

Ornamental Oregano
Origanum laevigatum 'Pilgrim' Origanum laevigatum 'Pilgrim' Origanum laevigatum 'Herrenhausen' Origanum laevigatum 'Herrenhausen'
4 Cultivars/Varieties

Origanum majorana

Knotted Marjoram, Marjoram, Pot Marjoram, Sweet Marjoram
Origanum majorana Origanum majorana Origanum majorana Origanum majorana Origanum majorana Origanum majorana Form Form Flowers Flowers Leaves on the square stems- opposite Leaves on the square stems- opposite
1 Cultivar/Variety

Origanum vulgare

Oregano
Origanum vulgare Origanum vulgare Origanum vulgare Origanum vulgare Oregano flowers Oregano flowers form, Wilson Botanical Garden, Wilson County, NC form, Wilson Botanical Garden, Wilson County, NC Flowers and form Flowers and form

Origanum vulgare subsp. hirtum

Greek Oregano, Oregano, Winter Sweet Marjoram
Origanum vulgare subsp. hirtum Origanum vulgare subsp. hirtum Origanum vulgare subsp. hirtum Origanum vulgare subsp. hirtum

Ornithogalum

Chincherinchee, Sea Onion, Star of Bethlehem, Summer Hyacinth
grassy leaves & clusters of white, star-shaped flowers. grassy leaves & clusters of white, star-shaped flowers. Form in November in Cape Town County, South Africa Form in November in Cape Town County, South Africa grassy leaves & clusters of white, star-shaped flowers. grassy leaves & clusters of white, star-shaped flowers. clusters of orange, star-shaped flowers. clusters of orange, star-shaped flowers. grassy leaves & clusters of yellow, star-shaped flowers. grassy leaves & clusters of yellow, star-shaped flowers. Flowers and buds in November in Cape Wineland County, S.Africa Flowers and buds in November in Cape Wineland County, S.Africa
5 Cultivars/Varieties

Ornithogalum thyrsoides

African Wonder Flower, Chincherinchee, Ornithogalum, Wonder Flower
An erect stalk of white, star-shaped flowers. An erect stalk of white, star-shaped flowers. A stalk of white, star-shaped flowers. A stalk of white, star-shaped flowers. White, star-shaped flowers with dark eyes. White, star-shaped flowers with dark eyes. Soil pulled back to reveal bulb. Soil pulled back to reveal bulb.

Ornithogalum umbellatum

Dove's Dung, Star of Bethlehem
An umbel of white, star-shaped flowers. An umbel of white, star-shaped flowers. An umbel of white, star-shaped flowers. An umbel of white, star-shaped flowers. Ornithogalum flower Ornithogalum flower

Orontium aquaticum

Bog Torches, Golden Club
Form in bloom (Darlington County, SC)-Mid Spring Form in bloom (Darlington County, SC)-Mid Spring Yellow spadix (Darlington County, SC)-Mid Spring Yellow spadix (Darlington County, SC)-Mid Spring Yellow spadix (Darlington County, SC)-Mid Spring Yellow spadix (Darlington County, SC)-Mid Spring Leaves (Darlington County, SC)-Mid Spring Leaves (Darlington County, SC)-Mid Spring Stem and spadix (Darlington County, SC)-Mid Spring Stem and spadix (Darlington County, SC)-Mid Spring Berry-like green fruit (Darlington County, SC)-Mid Spring Berry-like green fruit (Darlington County, SC)-Mid Spring

Orthophytum gurkenii

Gurken's Orthophytum
Striped, toothed leaves & inflorescence with green bracts. Striped, toothed leaves & inflorescence with green bracts.

Oscularia piquetbergensis

Ice Plant
Form in June in West Coast County in South Africa Form in June in West Coast County in South Africa Leaves in June in West Coast County in South Africa Leaves in June in West Coast County in South Africa Flowers in October in West Coast County in South Africa Flowers in October in West Coast County in South Africa Leaves and fruit in November in West Coast County, South Africa Leaves and fruit in November in West Coast County, South Africa

Osmanthus delavayi

Delavay Tea Olive
Natural Form Natural Form Flowers Flowers Osmanthus delavayi Osmanthus delavayi Hedge form Hedge form Leaves and stem Leaves and stem

Osmanthus fragrans

Fragrant Tea Olive, Sweet Osmanthus, Tea Olive
Close up of leaves and flowers Close up of leaves and flowers Rouded growth habit Rouded growth habit Growth habit Growth habit Osmanthus fragrans Osmanthus fragrans Pruned into a tree form Pruned into a tree form Osmanthus fragrans Osmanthus fragrans
7 Cultivars/Varieties

Osmanthus heterophyllus

Chinese Holly, False Holly, False Olive, Holly-leaf Osmanthus, Holly Olive, Holly Osmanthus, Holly Tea Olive
Osmanthus heterophyllus Osmanthus heterophyllus Osmanthus heterophyllus Osmanthus heterophyllus Osmanthus heterophyllus Osmanthus heterophyllus Osmanthus heterophyllus Osmanthus heterophyllus Hedge Hedge Leaves Leaves
6 Cultivars/Varieties

Osmanthus x burkwoodii

Burkwood Osmanthus
Tubular white fragrant flowers Tubular white fragrant flowers Leaves Leaves Flowers and leathery leaves Flowers and leathery leaves Shrub with thousands of small white flowers. Shrub with thousands of small white flowers. Hand holding leafy shoot with white tubular flowers. Hand holding leafy shoot with white tubular flowers. Close-up of white tubular flowers, each with 2 anthers. Close-up of white tubular flowers, each with 2 anthers.
2 Cultivars/Varieties

Osmanthus x fortunei

Fortune's Osmanthus, Fortune's Tea Olive
Osmanthus x fortunei in the fall in Moore County Osmanthus x fortunei in the fall in Moore County Osmanthus x fortunei Osmanthus x fortunei Osmanthus x fortunei Osmanthus x fortunei Osmanthus x fortunei in the fall in Moore County Osmanthus x fortunei in the fall in Moore County Osmanthus x fortunei Osmanthus x fortunei Shrub with dark green leaves. Shrub with dark green leaves.
3 Cultivars/Varieties

Osmunda

Ferns, Flowering Ferns
Osmunda Osmunda Osmunda Osmunda Leaves Leaves

Osmunda claytoniana

Clayton's Fern, Interrupted Fern
Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana Osmunda claytoniana

Osmunda regalis

Flowering Fern, Royal Fern
Plant Plant Form Form Frond Frond Form Form Frond Frond Frond Frond

Osmunda spectabilis

Royal Fern
Osmunda spectabilis Osmunda spectabilis Osmunda spectabilis Osmunda spectabilis Osmunda spectabilis Osmunda spectabilis

Osmundastrum cinnamomeum

Cinnamon Fern
Form Form Form Form Form Form Fronds Fronds Unfurling fronds Unfurling fronds Fertile fronds Fertile fronds

Ostrya virginiana

American Hop-hornbeam, Eastern Hop Hornbeam, Hop Hornbeam, Hop Horn Beam, Ironwood, Leverwood, Wooly Hop hornbeam
Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana Ostrya virginiana

Oxalis

Clover, False Shamrock, Good Luck Plant, Lucky Clover, Oxalis, Shamrock, Shamrock Plant, Sleeping Beauty, Sorrel, Sour Clover, Sour Grass, Wood-sorrel
Flowers and Leaves Flowers and Leaves Oxalis violaccea Oxalis violaccea Flowers Flowers Oxalis bifida Oxalis bifida Oxalis stricta Oxalis stricta Entire plant with roots and rhizomes exposed Entire plant with roots and rhizomes exposed
19 Cultivars/Varieties

Oxalis articulata

Oxalis, Pink Oxalis, Pink Wood Sorrel
Plantation Plantation Form Close-up Form Close-up Oxalis articulata Oxalis articulata Oxalis articulata Oxalis articulata
4 Cultivars/Varieties

Oxalis corniculata

Creeping Woodsorrel
Oxalis corniculata L. Oxalis corniculata L. Oxalis corniculata L. Oxalis corniculata L. Oxalis corniculata L. Oxalis corniculata L. Oxalis corniculata Creeping-Woodsorrel Oxalis corniculata Creeping-Woodsorrel Oxalis corniculata L. Oxalis corniculata L.

Oxalis grandis

Great Yellow Wood-sorrel, Large Yellow Wood-sorrel, Oxalis, Sourgrass
Oxalis grandis Oxalis grandis Oxalis grandis Oxalis grandis

Oxalis montana

American Wood-sorrel, Common Wood Sorrel, Mountain Woodsorrel, Northern Woodsorrel, Sourgrass, Sours, White Woodsorrel, White Wood-sorrel, Wood Shamrock, Wood-shamrock
Flower Flower

Oxalis stricta

Common Yellow Woodsorrel, Lemon Clover, Oxalis, Pickle Plant, Shamrock Plant, Sourgrass, Wood Sorrel, Yellow Woodsorrel, Yellow Wood Sorrel
Oxalis stricta habit Oxalis stricta habit Oxalis stricta abaxial leaflet surface Oxalis stricta abaxial leaflet surface Oxalis stricta stem Oxalis stricta stem Flowers Flowers Flowers Flowers Plant Plant

Oxalis triangularis

False Shamrock, Love Plant, Purple Shamrock, Purple Wood Sorrel
Form Form Flowers Flowers Leaves Leaves Green leaves Green leaves Leaves Leaves 'Myka' - Leaves - April 22 - Wake Co., NC 'Myka' - Leaves - April 22 - Wake Co., NC
6 Cultivars/Varieties

Oxalis violacea

Violet Woodsorrel, Violet Wood Sorrel, Violet Wood-sorrel
Flower Flower

Oxydendrum arboreum

Lily of the Valley Tree, Sorrel Tree, Sourwood
Oxydendrum arboreum showing red leaves of autumn. Oxydendrum arboreum showing red leaves of autumn. Flowers Flowers Oxydendrum arboreum leaves in the fall in Moore County Oxydendrum arboreum leaves in the fall in Moore County Oxydendrum arboreum Oxydendrum arboreum Oxydendrum arboreum Oxydendrum arboreum Oxydendrum arboreum Oxydendrum arboreum
2 Cultivars/Varieties

Oxypetalum coeruleum

Tweedia
Oxypetalum caeruleum = Tweedia caerulea Oxypetalum caeruleum = Tweedia caerulea
2 Cultivars/Varieties

Oxytropis

Locoweed, Loco Weed
small tufted plant in dry gravel small tufted plant in dry gravel clusters of white legume flowers clusters of white legume flowers small plant with spikes of white flowers small plant with spikes of white flowers dried legume fruits split open. dried legume fruits split open. fuzzy capsules and purple legume flowers. fuzzy capsules and purple legume flowers.

Pachira aquatica

French Peanut, Guiana Chestnut, Malabar Chestnut, Mexican Fortune Tree, Money Plant, Money Tree, Water Chestnut
potted plant with palmately compound leaves. potted plant with palmately compound leaves. potted plant with palmately compound leaves & woody stem. potted plant with palmately compound leaves & woody stem. Pachira aquatica houseplant view Pachira aquatica houseplant view Large tree with rounded canopy, growing in a park. Large tree with rounded canopy, growing in a park. Pachira aquatica leaf view Pachira aquatica leaf view Flower with five petals and many red-tipped, long stamens. Flower with five petals and many red-tipped, long stamens.

Pachysandra procumbens

Allegheny Spurge, Mountain Pachysandra
Pachysandra procumbens Pachysandra procumbens Pachysandra procumbens Pachysandra procumbens Pachysandra procumbens Pachysandra procumbens Pachysandra procumbens Pachysandra procumbens Leaves Leaves Leaves Leaves

Pachysandra terminalis

Carpet Box, Japanese Pachysandra, Japanese Spurge, Pachysandra
Pachysandra terminalis Pachysandra terminalis Pachysandra terminalis Pachysandra terminalis Pachysandra terminalis Pachysandra terminalis Flowers Flowers Pachysandra terminalis Leaf Pachysandra terminalis Leaf Pachysandra terminalis Pachysandra terminalis
4 Cultivars/Varieties

Packera anonyma

Appalachian Ragwort, Plain Ragwort, Small's Ragwort, Southern Ragwort
Form Form Flowers Flowers Back of flower Back of flower Lobed leaf and stem Lobed leaf and stem Basal leaves Basal leaves Native habitat Native habitat

Packera aurea

Golden Groundsel, Golden Ragwort
Full Form (Haywood County,NC)-Spring Full Form (Haywood County,NC)-Spring Form Form Close up of golden yellow daisy-like flowers. Close up of golden yellow daisy-like flowers. Packera aurea Packera aurea Flower bud - March 23 - Haywood Co., NC Flower bud - March 23 - Haywood Co., NC Packera aurea Packera aurea
1 Cultivar/Variety

Paeonia hybrids

Garden Peony, Herbaceous peony, Hybrid Peony, Peony
Paeonia 'Paul M. Wilder' Paeonia 'Paul M. Wilder' macro view inside flower, Catawba County, NC macro view inside flower, Catawba County, NC Paeonia hybrid Paeonia hybrid 'Sarah Berhardt' peony flower 'Sarah Berhardt' peony flower Paeonia hybrid Paeonia hybrid 'Festiva Maxima' Peony flower, Orange Co. 'Festiva Maxima' Peony flower, Orange Co.
16 Cultivars/Varieties

Paeonia x suffruticosa

Tree Peony
Full Form Full Form Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa Paeonia suffruticosa
1 Cultivar/Variety

Panax quinquefolius

American Ginseng, Sang
Form Form Flowers Flowers Fruit Fruit Flowers opening Flowers opening Plant Plant Leaves Leaves

Pancratium maritimum

Spider Lily
Hymenocallis caroliniana Hymenocallis caroliniana Form Form Form Form Flower Flower Flower Flower Flower Flower

Pandanus tectorius

Pandan, Screw Pine
Native habitat Native habitat leaf detail (Lim Chu Kang, Singapore)-Late Summer leaf detail (Lim Chu Kang, Singapore)-Late Summer Form Form Form Form Bracts and male flowers Bracts and male flowers Fruit Fruit
2 Cultivars/Varieties

Pandorea pandorana

Pandora Vine, Spearwood, Wonga Vine, Wonga-wonga Vine
Flowers Flowers Form Form Flowers Flowers Flower buds Flower buds Unripe fruits Unripe fruits Ripe fruits Ripe fruits
5 Cultivars/Varieties

Panicum amarum

Bitter Panicgrass, Bitter Panicum, Bitter Switchgrass, Coastal Switchgrass, Panic Grasses, Seabeach Grass, Switchgrass
Panicum amarum Elliott var. amarulum Panicum amarum Elliott var. amarulum Panicum amarum 'Dewy Blue' Panicum amarum 'Dewy Blue' Panicum amarum 'Dewy Blue' Panicum amarum 'Dewy Blue' Panicum amarum Panicum amarum Panic Grass Panic Grass Panic Grass - Up Close Leaves Panic Grass - Up Close Leaves
1 Cultivar/Variety

Panicum virgatum

Panic Grass, Panic Grasses, Switchgrass, Switch Grass, Tall Panic Grass, Thatchgrass, Wild Redtop
Panicum virgatum Panicum virgatum Purplish seed heads (Lambton, Toronto, ON)-Early Fall Purplish seed heads (Lambton, Toronto, ON)-Early Fall Stem and leaf attachment (Lambton, Toronto, ON)-Early Fall Stem and leaf attachment (Lambton, Toronto, ON)-Early Fall Leaf sheath and hairs (Lambton, Toronto, ON)-Early Fall Leaf sheath and hairs (Lambton, Toronto, ON)-Early Fall Leaf sheath and stem (Lambton, Toronto, ON)-Early Fall Leaf sheath and stem (Lambton, Toronto, ON)-Early Fall Panicle (Lambton, Toronto, ON)-Early Fall Panicle (Lambton, Toronto, ON)-Early Fall
12 Cultivars/Varieties