Lorchen, maybe this link will help:
http://davesgarden.com/guides/articles/view/2523/
In many parts of the United States, blueberries are mistakenly called huckleberries. Some people believe that blueberries are always blue while huckleberries are black or very dark purple. This is erroneous thinking, however, for some blueberries are very dark colored, and some huckleberries are very blue. One sure way to tell is to examine the seeds. Blueberries have many small, tiny, soft seeds, while huckleberries have ten large, crunchy seeds.
Both huckleberries (Gaylussacia) and blueberries (Vaccinium) belong to the heath family (Ericaceae). About 50 species have been identified. The majority of them are native to South America, while seven or eight species are native to the eastern United States. While many of the western states claim to have huckleberries, what they really have are members of the closely related Vaccinium genus.
Generally speaking, leaves of the Gaylussacia species are alternate, and the undersides have yellow resin dots that can be seen with a hand lens. This resin causes the leaves to be somewhat sticky. Some species are evergreen while others are deciduous.
Flowers are white to pink and urn or bell-shaped, and appear in spring in small axillary clusters. Fruits are small, round, shiny berrylike drupes that ripen in late summer. Shrubs are multi-stemmed, slender, and arise from underground rhizomes.