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And yes, they will grow in WI cause I used to have them in WA and now they are thriving in central IL.
For even further info, below is some information from Allan Armitage's Herbacious Perennial Plants book.
"Flowers 6-12, petals strongly reflexed, pedicals (stems of individual flowers) not over 1/2" long." These would be English Bluebells (Hyacinthoides non-scripta)
"Flowers usually 12 or more, petals flared but not reflexed, flower pedicals to 1 1/2" long" These would be Spanish Bluebells (Hyacinthoides hispanica)
Armitage also states that "the two species, H. Hispanica, Spanish bluebell, and H. non-scripta, English bluebell, readily hybridize when planted near each other and many intermediate forms exist."