Commonly known as cranesbills, the genus Geranium - from Geranos, a crane,
encompasses a diverse group of plants together with many hybrids and cultivars.
There are some 300 species, mostly perennial and some sub-shrubs.
Most grow in the temperate regions of the world.

I have included these in my pelargonium/geranium patch for a contrast of colour and
planted them near the edge of the bed.