Geranium (psilostemon)
Pelargonium (sidoides)
Geranium (sanguineum)
Pelargonium (Royal Oak)
Geranium (pratense)
Pelargonium (Sweet Mimosa)
Geranium (palmatum)
Pelargonium (Cola Bottles)
Geranium (robertianum, herb robert) 
Pelargonium (Lemon Fancy)
Geranium (pyrenaicum)
Pelargonium (the one that used to be common in chip shops in London)
you get the idea….
not to scale.
like a little black book 
So Herb Robert is a thing and I shouldn’t pull it out as if a weed?
oh, it’s definitely a weed… a weed to live with, but we don’t want it to get out of hand