It is many kinds of bogs, of course, from the very wet Sphagnum mires to the rich swamps with a plethora of flowering plants.
Here are a few to start with - please feel free to add your plants!
In the sphagnum moss mires you can often find find a little drier areas and there the cloudberry (Rubus chamaemorus) are growing in abundance. However, that don't mean you will have lots of berries to harvest! The plant is dioecious and spreads by runners so you find huge patches of clones of the same plant.
The first picture shows a typical cloudberry bog in an untypical Easter condition in the mountains. At this time of the year you expect it to be covered by 1/2 - 1m snow. The next pictures show a male and a female flower.
Also in wet areas both in sphagnum bogs and in richer soil you can find the lanky Marsh Cinquefoil (Potentilla (Comarum) palustris). The petals are rather small but have a nice colour. It is said that the colour of the redflowered strawberry plants is derived from crosses with this species. Anyway, the flowers are appreciated by bumblebees.
The Water Avens (Geum rivale) doesn't grow in the wettest bogs but often on soil seasonally saturated with water. You have to take a close look at the flower to see its beauty.