1	"Leaf peltate, glabrous"	"Pelargonium peltatum"
1	"Leaf not peltate, glabrous or not"	2
2	"Leaf blade +- as long as wide"	3
2	"Leaf blade longer than wide or wider than long"	5
3	"Leaf membranous, hairs 0 or sparse; petals pink-purple"	"Pelargonium zonale"
3	"Leaf +- succulent, hairs dense; petals red to white"	4
4	"Leaf blade 15--20 cm wide; petals red to white"	"Pelargonium X hortorum"
4	"Leaf blade generally 4--8 cm wide; petals red"	"Pelargonium inquinans"
5	"Flower < 10 mm wide; stem slender, < 3 mm diam"	"Pelargonium grossularioides"
5	"Flower 15--40 mm wide; stem stout, > 3 mm diam"	6
6	"Inflorescence +- lax; flower 30--40 mm wide; leaf blade abaxially hairier, of different color than adaxially"	"Pelargonium panduriforme"
6	"Inflorescence dense; flower 15--18 mm wide; leaf blade abaxially, adaxially equally hairy, of same color"	7
7	"Plant prostrate to sprawling; margins of lower leaves irregularly curled; inflorescence 8--20-flowered"	"Pelargonium capitatum"
7	"Plant erect; margins of lower leaves not curled; inflorescence 3--12-flowered"	"Pelargonium vitifolium"