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Ornithogalum

Ornithogalum thyrsoides
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.

Orphan John

Hylotelephium telephium
Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium
8 Cultivars/Varieties

Orpine

Hylotelephium telephium
Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium Hylotelephium telephium
8 Cultivars/Varieties

Orpine

Hylotelephium
Hylotelephium Hylotelephium Hylotelephium Hylotelephium Hylotelephium Hylotelephium Hylotelephium Hylotelephium hylotelephium maximum hylotelephium maximum Succulent, gray-green leaves in a tight, low mound. Succulent, gray-green leaves in a tight, low mound.
9 Cultivars/Varieties

Osage Crape Myrtle

Lagerstroemia 'Osage'
Lagerstroemia 'Osage' Lagerstroemia 'Osage' Lagerstroemia 'Osage' Lagerstroemia 'Osage' Lagerstroemia Osage Lagerstroemia Osage

'Osage' Crape Myrtle

Lagerstroemia 'Osage'
Lagerstroemia 'Osage' Lagerstroemia 'Osage' Lagerstroemia 'Osage' Lagerstroemia 'Osage' Lagerstroemia Osage Lagerstroemia Osage

Osage-Orange

Maclura pomifera
Flower Flower Fruit Fruit Form Form Close up fruit Close up fruit Yellow fall color Yellow fall color Cut open fruit with milky sap. Cut open fruit with milky sap.
3 Cultivars/Varieties

Osceola's Plume

Stenanthium densum
Flower stalk Flower stalk Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum Stenanthium densum

Oshima Kan Suge

Carex oshimensis
Carex hachijoensis 'Evergold' Carex hachijoensis 'Evergold' Carex hachijoensis 'Evergold' Carex hachijoensis 'Evergold' Grassy tufted plant. Grassy tufted plant. Erect spikes of brownish, faded flowers. Erect spikes of brownish, faded flowers. Grassy green leaves with a central white stripe. Grassy green leaves with a central white stripe. Grassy green leaves with a central white stripe; erect spikes. Grassy green leaves with a central white stripe; erect spikes.
3 Cultivars/Varieties

Oshima Sedge

Carex oshimensis
Carex hachijoensis 'Evergold' Carex hachijoensis 'Evergold' Carex hachijoensis 'Evergold' Carex hachijoensis 'Evergold' Grassy tufted plant. Grassy tufted plant. Erect spikes of brownish, faded flowers. Erect spikes of brownish, faded flowers. Grassy green leaves with a central white stripe. Grassy green leaves with a central white stripe. Grassy green leaves with a central white stripe; erect spikes. Grassy green leaves with a central white stripe; erect spikes.
3 Cultivars/Varieties

Oso Easy® Urban Legend® rose

Rosa Oso Easy® Group
Single cherry red flowers. Single cherry red flowers. Single very pale pink flowers. Single very pale pink flowers. Single pale orange flower. Single pale orange flower.
12 Cultivars/Varieties

O. Spring Chinese Holly

Ilex cornuta 'O. Spring'
Ilex cornuta 'O'Spring' Ilex cornuta 'O'Spring' Ilex cornuta 'O'Spring' Ilex cornuta 'O'Spring' Ilex cornuta 'O'Spring' Ilex cornuta 'O'Spring'

Ostrich-Feather Fern

Onoclea struthiopteris
fern. fern. fronds. fronds. fronds. fronds. fronds. fronds. fern. fern. curled, emerging fronds. curled, emerging fronds.
1 Cultivar/Variety

Ostrich Fern

Onoclea struthiopteris
fern. fern. fronds. fronds. fronds. fronds. fronds. fronds. fern. fern. curled, emerging fronds. curled, emerging fronds.
1 Cultivar/Variety

Oswego Tea

Monarda
Close-up of pale pink flowers in a dense head-like cluster. Close-up of pale pink flowers in a dense head-like cluster. A clump of pink-flowered plants. A clump of pink-flowered plants. Red tubular flowers borne in terminal heads. Red tubular flowers borne in terminal heads. Close-up on honeybee on the flowers Close-up on honeybee on the flowers Leaves borne in the opposite decussate arrangement. Leaves borne in the opposite decussate arrangement. close-up of dense whorls of pink flowers. close-up of dense whorls of pink flowers.
10 Cultivars/Varieties

Oswego Tea

Monarda didyma
Erect leafy shoots with terminal clusters of deep pink flowers. Erect leafy shoots with terminal clusters of deep pink flowers. plant with Lantana camara 'Miss Huff' in summer in Moore County plant with Lantana camara 'Miss Huff' in summer in Moore County Erect leafy shoots with terminal clusters of scarlet flowers. Erect leafy shoots with terminal clusters of scarlet flowers. Erect leafy shoots with terminal clusters of red flowers. Erect leafy shoots with terminal clusters of red flowers. Emerging growth with opposite decussate leaves. Emerging growth with opposite decussate leaves. Erect leafy shoots with terminal clusters of deep pink flowers. Erect leafy shoots with terminal clusters of deep pink flowers.
4 Cultivars/Varieties

Otto Luyken Cherry Laurel

Prunus laurocerasus 'Otto Luyken'
Erect racemes of white flowers held above glossy foliage. Erect racemes of white flowers held above glossy foliage. Raceme of white flowers with yellow hypanthia. Raceme of white flowers with yellow hypanthia. Close-up of white flowers with yellow hypanthia & green pistils Close-up of white flowers with yellow hypanthia & green pistils Erect racemes of white flowers held above glossy foliage. Erect racemes of white flowers held above glossy foliage. Glossy, lanceolate leaves & very young inflorescence bud Glossy, lanceolate leaves & very young inflorescence bud Glossy, lanceolate leaves & very young inflorescence buds Glossy, lanceolate leaves & very young inflorescence buds

Otto Luyken's Laurel

Prunus laurocerasus 'Otto Luyken'
Erect racemes of white flowers held above glossy foliage. Erect racemes of white flowers held above glossy foliage. Raceme of white flowers with yellow hypanthia. Raceme of white flowers with yellow hypanthia. Close-up of white flowers with yellow hypanthia & green pistils Close-up of white flowers with yellow hypanthia & green pistils Erect racemes of white flowers held above glossy foliage. Erect racemes of white flowers held above glossy foliage. Glossy, lanceolate leaves & very young inflorescence bud Glossy, lanceolate leaves & very young inflorescence bud Glossy, lanceolate leaves & very young inflorescence buds Glossy, lanceolate leaves & very young inflorescence buds

Our Lady's Bells

Campanula trachelium
Campanula trachelium flower Campanula trachelium flower Bloom close up Bloom close up Bloom close up Bloom close up Flower and upper leaves Flower and upper leaves Campanula trachelium form Campanula trachelium form Form Form
3 Cultivars/Varieties

Our Lady's Milk Drops

Pulmonaria officinalis
Pulmonaria officinalis Pulmonaria officinalis small hairs or trichomes on flower bugs and leaves small hairs or trichomes on flower bugs and leaves Pulmonaria officinalis Pulmonaria officinalis Pulmonaria officinalis Pulmonaria officinalis Pulmonaria officinalis Pulmonaria officinalis 'Trevi Fountain' Flower & Leaves - April 15 - Wake Co., NC 'Trevi Fountain' Flower & Leaves - April 15 - Wake Co., NC
1 Cultivar/Variety

Outta the Blue

Rosa Outta The Blue™ 'WEKstephitsu'
Pink fully double hybrid rose Pink fully double hybrid rose Pink fully double hybrid rose Pink fully double hybrid rose

Oval Leaf Peperomia

Peperomia obtusifolia
Form Form Peperomia obtusifolia Peperomia obtusifolia Plant with rubbery, obovate leaves and spikes of minute flowers. Plant with rubbery, obovate leaves and spikes of minute flowers. Shiny, rubbery leaves and upright spikes of minute flowers. Shiny, rubbery leaves and upright spikes of minute flowers. Stem and Leaves Stem and Leaves Peperomia obtusifolia Peperomia obtusifolia
6 Cultivars/Varieties

Overcup Oak

Quercus lyrata
Form (Pitt County, NC)-Late Fall Form (Pitt County, NC)-Late Fall Branches (Pitt County, NC)-Late Fall Branches (Pitt County, NC)-Late Fall Branches (Pitt County, NC)-Late Fall Branches (Pitt County, NC)-Late Fall Form and acorn Form and acorn Leaves and acorns (Morris Arboretum, Philadelphia, PA) Leaves and acorns (Morris Arboretum, Philadelphia, PA) Entire leaf margin (Pitt County, NC)-Late Fall Entire leaf margin (Pitt County, NC)-Late Fall

Overleese Pawpaw

Asimina triloba 'Overleese'
Hand cradling one of a pair of green, smooth fruit. Hand cradling one of a pair of green, smooth fruit. Green fruit on leafy branches. Fruit is smooth and ovoid. Green fruit on leafy branches. Fruit is smooth and ovoid.

Owl's Head

Platanthera ciliaris
Flower - Closeup - Late summer - Croatan National Forest - NC Flower - Closeup - Late summer - Croatan National Forest - NC Form - Late summer - Croatan National Forest - NC Form - Late summer - Croatan National Forest - NC Flower - Late summer - Croatan National Forest - NC Flower - Late summer - Croatan National Forest - NC View of the inflorecence from the top. Frederick Co., Maryland View of the inflorecence from the top. Frederick Co., Maryland Flowers bloom from the bottom of the inflorescence to the top. Flowers bloom from the bottom of the inflorescence to the top. Simple leaves clasp the stem. Simple leaves clasp the stem.

Oxalis

Oxalis grandis
Oxalis grandis Oxalis grandis Oxalis grandis Oxalis grandis

Oxalis

Oxalis stricta
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

Oxalis
Trifoliolate leaves & 5-petaled white flowers with pink stripes. Trifoliolate leaves & 5-petaled white flowers with pink stripes. Ternate leaves & pink, 5-petaled flowers. Ternate leaves & pink, 5-petaled flowers. Pink, 5-petaled flowers with darker striations. Pink, 5-petaled flowers with darker striations. Close-up of the pink, 5-petaled flower. Close-up of the pink, 5-petaled flower. Ternate leaves & yellow, 5-petaled flowers. Ternate leaves & yellow, 5-petaled flowers. Entire plant with roots and rhizomes exposed Entire plant with roots and rhizomes exposed
19 Cultivars/Varieties

Oxalis

Oxalis articulata
Plantation Plantation Form Close-up Form Close-up clover like leaves clover like leaves Oxalis articulata Oxalis articulata Oxalis articulata Oxalis articulata
4 Cultivars/Varieties

Oxblood Lilies

Hypoxis
Form in September in Launceston TAS, Australia Form in September in Launceston TAS, Australia Form with Flower in September in Montgomery, TX Form with Flower in September in Montgomery, TX Sprout in September in Greenville, Rhode island Sprout in September in Greenville, Rhode island Close up of yellow flow with 6 sepals Close up of yellow flow with 6 sepals H. hemerocallidea Leaves and flower H. hemerocallidea Leaves and flower Lose up of a green leaf Lose up of a green leaf
2 Cultivars/Varieties

Ox-eye

Heliopsis helianthoides
Form Form Flowers and foliage Flowers and foliage Bloom Bloom Heliopsis helianthoides 'Summer Nights' Heliopsis helianthoides 'Summer Nights' Leaves in spring Leaves in spring 'Sunstruck' 'Sunstruck'
11 Cultivars/Varieties

Oxeye Daisy

Leucanthemum vulgare
Leucanthemum vulgare Leucanthemum vulgare Leucanthemum vulgare Leucanthemum vulgare
2 Cultivars/Varieties

Ox-eye Daisy

Leucanthemum vulgare
Leucanthemum vulgare Leucanthemum vulgare Leucanthemum vulgare Leucanthemum vulgare
2 Cultivars/Varieties

Oxeye Sunflower

Heliopsis helianthoides
Form Form Flowers and foliage Flowers and foliage Bloom Bloom Heliopsis helianthoides 'Summer Nights' Heliopsis helianthoides 'Summer Nights' Leaves in spring Leaves in spring 'Sunstruck' 'Sunstruck'
11 Cultivars/Varieties

Oxford-ivy

Cymbalaria muralis
Front view of flower (Port Deposit, MD)-Mid Summer Front view of flower (Port Deposit, MD)-Mid Summer Side view of flower (Port Deposit, MD)-Mid Summer Side view of flower (Port Deposit, MD)-Mid Summer Seed capsule side view (Port Deposit, MD)-Mid Summer Seed capsule side view (Port Deposit, MD)-Mid Summer Seed capsules (Port Deposit, MD)-Mid Summer Seed capsules (Port Deposit, MD)-Mid Summer Green leaves with lobed margins (Port Deposit, MD)-Mid Summer Green leaves with lobed margins (Port Deposit, MD)-Mid Summer Plant growing on a structure (Port Deposit, MD)-Mid Summer Plant growing on a structure (Port Deposit, MD)-Mid Summer
1 Cultivar/Variety

Oxfordshire

Rosa Baby Blanket® 'KORfullwind'
Flowers Flowers Flowers and leaves Flowers and leaves Flower buds Flower buds

Ox Heel

Helleborus foetidus
Helleborus foetidus Helleborus foetidus Used in the landscape Used in the landscape Helleborus foetidus Helleborus foetidus Helleborus foetidus Helleborus foetidus Helleborus foetidus Helleborus foetidus Helleborus foetidus Helleborus foetidus
7 Cultivars/Varieties

Oxlip

Primula elatior
Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior Primula elatior

Ox Tongue

Gasteria gracilis
Form Form Form in bloom Form in bloom Close up of flower Close up of flower Flower stem forming Flower stem forming Form Form Form Form
1 Cultivar/Variety

Oxyacantha

Crataegus douglasii
Flower Flower Leaves Leaves Leaves in Fall Leaves in Fall Fruit Fruit Thorn Thorn Mature Bark Mature Bark

Oyama Magnolia

Magnolia sieboldii
Form in June in Huangshan in China Form in June in Huangshan in China Flower & leaves in June in Peongchang in South Korea Flower & leaves in June in Peongchang in South Korea

Oyster Plant

Tradescantia spathacea
Leaves Leaves flower closeup flower closeup Flowers Flowers Form Form Purple undersides Purple undersides Tradescantia spathacea Tradescantia spathacea
3 Cultivars/Varieties

Oyster Plant

Acanthus mollis
Spreading habit in bloom Spreading habit in bloom Flower spike of two lipped tubular white sepal & purple hoods Flower spike of two lipped tubular white sepal & purple hoods Rounded spreading habit Rounded spreading habit Close up two lipped tubular white flowers with purple hoods. Close up two lipped tubular white flowers with purple hoods. Closeup of dark green glossy deeply lobed large leaves Closeup of dark green glossy deeply lobed large leaves Green oval seeds on a spike Green oval seeds on a spike
1 Cultivar/Variety

Oyster Plant

Tragopogon porrifolius
T. porrifolius T. porrifolius T. porrifolius T. porrifolius T. porrifolius T. porrifolius Tragopogon porrifolius Tragopogon porrifolius Tragopogon porrifolius Tragopogon porrifolius Tragopogon porrifolius Tragopogon porrifolius

Ozark Coneflower

Echinacea paradoxa
flowers flowers flowers flowers flowers flowers leaves and flowers leaves and flowers Flower Flower flower flower

Ozark Premier Japanese Plum

Prunus salicina 'Ozark Premier'

Ozark Witch Hazel

Hamamelis vernalis
Flowers with yellow ribbon-like petals Flowers with yellow ribbon-like petals Large multi-stemmed shrub in Jan. Large multi-stemmed shrub in Jan. Green shrub in July Green shrub in July Yellow flowers in clusters Yellow flowers in clusters Hamamelis vernalis Hamamelis vernalis Hamamelis vernalis Hamamelis vernalis
6 Cultivars/Varieties

Pachysandra

Pachysandra terminalis
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