The Symbolic Meaning for Flowers

Amaryllis - Pride
Apple Blossom - Hope, good fortune, better things to come
Bellflower - Gratitude
Blue Periwinkle - Friendship
Blue Violet - Modesty, faithfulness
Bluebells - Constancy
Cala Lily - Splendid Beauty
Camellia - Loveliness, gratitude
Carnation - Distinction, fascination
Chrysanthemum (red) - I love you
Chrysanthemum (white) - Truth
Cyclamen - Modesty and shyness
Daffodil - Regard
Daisy - Beauty & Innocence
Fern - Fascination and sincerity
Flowering Almond - Hope
Forget-Me-Not - True love and remembrance
Gardenia - Secret Untold Love
Honeysuckle - Devoted affection, generosity
Hyacinth - Loveliness
Hydrangea - Boastfulness
Iris - Warmth of affection
Ivy - Eternal fidelity
Jasmine - Amiability
Larkspur - Laughter
Lemon Blossom - Fidelity in love
Lilac - First Love
Lilac (white) - Youthful innocence
Lily - Majesty
Lily-of-the-Valley - Return of happiness
Magnolia - Perseverance
Marigold - Affection
Mimosa - Secret love
Myrtle - Love and remembrance
Orange Blossoms - Purity or fertility
Orchid - Rare beauty
Peach Blossom - Captive
Peony - Bashfulness
Red Chrysanthemum - Love
Red Rose - Passion

All roses say, I Love You, but each color has it's own meaning:
Burgundy - Unconscious Beauty
Orange or Coral - Desire
Pink - Grace and gentility
Red & White Together - Unity
Red - Passion
Sweetheart Roses - Darling, Dear or Honey
White - Worthiness
White Rosebuds - You're too young for love
Yellow - Joy

Rosemary - Remembrance
Sweet Pea - Delicate pleasures
Tulip - Love
Violet - Modesty, affection, faithfulness
Yellow Tulip - Hopeless love

Found at http://www.craftassoc.com/flowers.html