Here in the Pacific Northwest, we are having a bumper year for blueberries. While the excessively large crop is not great for farmers, it is great for blueberry lovers. Personally, I find these guys to be the best berry for u-pick: they’re not so short that you have to stoop to pick them, like with strawberries, they’re not squishy like raspberries, so you can pile them up in your bucket, and they’re not thorny like blackberries so that picking them isn’t an unpleasant ordeal.
As far as I know, if you see a field of woody, upright shrubs planted in rows, it’s probably blueberries.
Blueberries are in the genus Vaccinium in the Ericaceae; this genus includes many of our wild berries that foragers and bears love, including wild blueberries and huckleberries. Cranberries are in this genus as well. The flowers of this genus (and many of the other Ericaceae) are urn-shaped, with the petals united into a little bell. The fruit we eat develops from the inferior ovary, behind the petals and sepals of the flower. Sometimes if you pick blueberries yourself, you’ll see the dried-up petals remaining at the top of the berry.
Blueberries, depending on the variety, have more or less of that glaucous, whitish bloom on the outside. It’s normal.
According to Wikipedia, you can distinguish blueberries from their similar-looking wild relatives, the bilberries, huckleberries, and whortleberries, by the color of the flesh inside: raw blueberries are green inside, while the others are red or purple.
Ericaceae doesn’t give us many other crops. Many of its members have edible fruits, but they’re generally not tasty enough to cultivate. There are many ornamental plants in this family, though: azaleas and rhododendrons are probably the most popular.
Blueberries at wikipedia