1	"Flower +- bilateral; nectary 1, deeply embedded into receptacle; fertile stamens 1--7, united at base"	Pelargonium
1	"Flower radial (+- bilateral); nectaries 5, on petal bases; fertile stamens 5 or 10, free"	2
2	"Fertile stamens generally 10; leaf palmately lobed or divided"	Geranium
2	"Fertile stamens generally 5; leaf generally pinnately lobed to compound"	3
3	"Staminodes 0; leaf simple, +- palmately lobed or not, veins +- palmate"	"California {California macrophylla}"
3	"Staminodes 5, alternate stamens; leaf simple to pinnately compound, veins pinnate"	Erodium