Pelargonium peltatum
It's the wild version of the ivy leaved geranium hybrids.
Beautiful flowers but the branches of this wild species tend to grow very long. I live in an apartment and my neighbour below enjoyed most of the flowers. So don't let it hang free. It's easy to grow from seed.
Pelargonium quercifolium
This oak leaved geranium smells very strange, not a pleasant smell. (yes, it smells definitely bad
) The leaves are very rough, like sandpaper. In winter (when you have more blue light and less direct sun) the center of the leaves turns brown. The flowers are beautiful and the plant is very easy to grow.
Pelargonium cucullatum
It's related to the Regal/Martha Washington geranium.
Very attractive plant. The flowers are big for a wild species (but smaller than the Regal hybrids) and the plant gives plenty of them, (generally in groups of four). It is very showy as a pot plant because it is rather compact and bushy and it is very easy to grow from seeds.
