source: https://www.almanac.com/flower-meanings-language-flowers

• Abatina — Fickleness
• Acanthus — The fine art, Artifice
• Aloe — Affection, also Grief
• Amaryllis — Pride
• Anemone — Forsaken
• Angelica — Inspiration
• Apple blossom — Preference
• Arborvitae — Unchanging friendship
• Aster — Symbol of Love, Daintiness
• Bachelor’s button — Single blessedness
• Basil — Good wishes
• Bay tree — Glory
• Begonia — Beware
• Belledonna — Silence
• Bittersweet — Truth
• Black-eyed Susan — Justice
• Bluebell — Humility
• Borage — Bluntness, Directness
• Butterfly weed — Let me go
• Calla lily — Beauty
• Camellia, pink — Longing For You
• Camellia, red — You’re a Flame in My Heart
• Camellia, white — You’re Adorable
• Candytuft — Indifference
• Carnation — Fascination, female love, mother’s love
• – Red carnation — Alas for my poor heart, my heart aches, deep love
• – White carnation — Innocence, pure love, sweet love
• – Pink carnation — I’ll never forget you
• – Striped — Refusal
• – Yellow carnation — Disdain, Disappointment, Rejection
• Chamomile — Patience in adversity
• Chives — Usefulness
• Chrysanthemum, red — I love you
• Chrysanthemum, yellow — Slighted love
• Chrysanthemum, white — Truth
• Clematis — Mental beauty
• Clematis, evergreen — Poverty
• Clover, white — Think of me
• Columbine — Foolishness, folly
• - Columbine, purple — Resolution
• - Columbine, red — Anxious, Trembling
• Coreopsis — Always cheerful
• Coriander — Hidden worth/merit
• Crab blossom — Ill nature
• Crocus, spring — Cheerfulness, Youthful gladness
• Cyclamen — Resignation, Diffidence, Goodbye
• Daffodil — Regard, Unequalled Love
• Dahlia, single — Good taste
• Daisy — Innocence, Loyal love, I’ll never tell
• Daylily — Chinese emblem for mother
• Dill — Powerful against evil
• Edelweiss — Courage, devotion
• Fennel — Flattery
• Fern — Magic, Fascination, Secret bonds of love
• Forget-me-not — True love memories, Do not forget me
• Gardenia — You’re lovely, Secret love
• Geranium — Folly, Stupidity
• Gladiolus — Flower of the Gladiators, Integrity, Strength, Victory
• Goldenrod — Encouragement, Good fortune
• Heliotrope — Eternal love, Devotion
• Hibiscus — Delicate beauty
• Holly — Defense, Domestic happiness
• Hollyhock — Ambition
• Honeysuckle — Bonds of love
• Hyacinth — Sport, Game, Play
• – Blue Hyacinth — Constancy
• – Purple Hyacinth — Sorrow
• – Yellow Hyacinth — Jealousy
• – White Hyacinth — Loveliness, Prayers for someone
• Hydrangea — Gratitude for being understood; Frigidity and heartlessness
• Hyssop — Sacrifice, Cleanliness
• Iris — Faith, trust, Wisdom, Hope, Valor
• Ivy — Affection, Friendship, Fidelity
• Jasmine, white — Sweet love, Amiability
• Jasmine, yellow — Grace; Elegance
• Lady’s Slipper — Capricious beauty
• Larkspur — Open heart, levity, lightness, fickleness (pink or simple varieties).
• Lavender — Distrust 
• Lemon balm — Sympathy
• Lilac — Joy of youth
• Lily (white) — Virginity, Purity, Heavenly
• Lily (yellow) — Happy, Gay, Walking on air
• Lily (orange) — Hatred 
• Lily, tiger  — Wealth, Pride 
• Lily-of-the-valley — Sweetness, Tears of the Virgin Mary, Humility
• Lotus Flower — Purity, Enlightenment, Self-regeneration, and Rebirth
• Magnolia — Nobility, Love of nature
• Marigold  — Grief, jealousy
• Marjoram — Joy and happiness
• Mint — Virtue
• Morning glory — Affection
• Myrtle — Good luck, love in a marriage
• Nasturtium — Patriotism, Conquest, Victory in Battle
• Oak — Strength
• Oregano — Substance
• Pansy — Thoughts
• Parsley — Festivity
• Peony — Bashful, Happy Life or Shame
• Pine — Humility, Piety
• Poppy — Consolation
• Rhododendron — Danger, beware
• Rose, red — Love, I love you
• Rose, dark crimson — Mourning
• Rose, pink — Happiness
• Rose, white — Innocence, Heavenly, I’m worthy of you
• Rose, yellow — Jealousy, Decrease of love, Infidelity
• Rosemary — Remembrance
• Rue — Grace, clear vision
• Sage — Wisdom, immortality
• Salvia, blue — I think of you
• Salvia, red — Forever mine
• Savory — Spice, interest
• Snapdragon — Deception, Graciousness
• Sorrel — Affection
• Southernwood — Constancy, jest
• Spearmint — Warmth of sentiment
• Speedwell — Feminine fidelity
• Sunflower, dwarf — Adoration
• Sunflower, tall — Haughtiness
• Sweet pea — Blissful pleasures, Good-bye, Thank you for a lovely time
• Sweet William — Gallantry
• Sweet woodruff — Humility
• Tansy — Hostile thoughts, declaring war
• Tarragon — Lasting interest
• Thyme — Courage, strength
• Tulip, red — Passion, declaration of love
• Tulip, yellow — Sunshine in your smile
• Valerian — Readiness
• Violet — Watchfullness, Modesty, Faithfulness
• Willow — Sadness
• Yarrow — Everlasting love
• Zinnia — Thoughts of absent friends, lasting affection