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There are variations in soil acidity and this is by no means a complete list of acid loving plants, but I hope it is helpful:
pH 4.5 to 5.5
Achmines
Adiantum
African violet
Aloe
Amarylis
Aphelandra
Aurucaria - Norfolk Pine
Azalea
Begonia
Caladium
Calathea
Crossandra
Cyclamen
Dieffenbachia
Epiphyllum
Gardenia
Hydrangea
Impatiens
Maranta
Pellaea - a fern
Peperomia
Pilea
Polypodium
Primula
Rechsteineria
Saxifraga
Scindapsus
Streptocarpus
Syngonium
Zygocactus
pH 5.5 to 6.5
Anthurium
Bromeliad Cattleya
Columnea
Cymbidium
Cypripedium
Daffodil
Gladiolus
Hyacinth
Iris
Narcissus
Phalaenopsis
Platycerium
Thipsalidopsis
Tulip
Vanda
Woody Ornamentals and their pH preferances
pH 4.0 to 5.0
Spruce, Black
pH 4.5 to 5
Azalea
pH 4.5 to 6
Birch, European (White)
Heather
Rhododendron
pH 5 to 6
Most coniferous species would prefer a soil of this pH
Fir, Balsam
Hemlock
Pine, Jack less tolerant of pH above 6
Pine, Loblolly
Pine, Red Pinus resinosus less tolerant of pH above 6
Spruce, White
pH 5.0 to 6.5
Beech
Oak, Pin
Tamarack
pH 6 to 7
Most Hardwoods prefer a soil of this pH
Fir, Douglas
Oak, Black
Pine, White
Spruce, White
Yew, Japanese
pH 6 to 7.5
Ash, White
Maple, Sugar
Spruce, Colorado
Sycamore
pH 6 to 8.0
Walnut, Black
Vegetable crops and their pH preferances
pH 4.5 to 5.5
Radish
Sweet Potato
pH 4.8 to 5.5
Potato
pH 5.5 to 6.5
Endive
Parsley
Pepper
Rhubarb
Soybean
pH 5.5 to 7.0
Beans
Broccoli
Cabbage
Carrot
Celery
Cucumber
Pepper
Radish
Rhubarb
Squash
Sweet Corn
Sweet Potato
Tomato
Turnip
pH 5.5 to 7.5
Cauliflower
Onion
Tomato
pH 6.0 to 7.0
Broccoli
Celery
Lettuce
Lima Bean
Muskmellon
Parsnip
Pea
Spinach
pH 6.0 to 7.5
Beet, Table
Cabbage
Spinach
pH 6.0 to 8.0
Asparagus
Fruit Crops and their pH preferances
pH 4 to 5
Blueberry, High Bush
Cranberry, Large (4.2 to 5.0)
pH 4.5 to 5.5
Raspberry
pH 5 to 6.5
Apple
pH 5.5 to 6.5
Grape
Strawberry
pH 5.5 to 7.0
Raspberry, Red
pH 6.0 to 7.0
Apricot
Cherry, sour
pH 6.0 to 7.5
Cherry, Sweet
Crabapple
Peach
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