1	"Leaves serrulate, sometimes minutely so"	2
1	"Leaves entire but sometimes more or less crinkly"	4
2	"Lower leaf surfaces with scattered hairs when young, becoming glabrous or almost so"	"Croton talaeporos"
2	"Lower leaf surfaces more or less densely covered with scales and/or stellate hairs"	3
3	"Female flowers with styles 3× bifid; fruits about 16 mm in diametre, covered by brownish spreading, stellate hairs"	"Croton confertus"
3	"Female flowers with deeply bipartite styles; fruits about 5-6 mm long and 7-8 mm wide, with silvery stellate hairs"	"Croton schimperianus"
4	"Leaves crowded and almost whorled at the ends of twigs, their upper surfaces completely glabrous"	"Croton pseudopulchellus"
4	"Leaves clearly alternate, their upper surfaces with scales or stellate hairs, these sometimes inconspicous."	5
5	"At least some petioles more than 1 cm long"	6
5	"Petioles never more than 1 cm long"	7
6	"Fruits about 6 mm long and 7-8 mm wide, with septicidal dehiscence; racemes 1-3 cm long; styles bipartite"	"Croton somalensis"
6	"Fruits about 20 mm long and 22-25 mm wide, with loculicidal dehiscence; racemes 6-19 cm long; styles palmatifid into about 8 lobes"	"Croton megalocarpoides"
7	"Leaves lanceolate to narrowly ovate, upper surfaces yellow-green, margins flat ; scales on stems and undersides of leaves usually brown; stellate hairs not present"	"Croton menyharthii"
7	"Leaves more or less broadly elliptic or ovate, upper surfaces dark green, margins more or less crinkly; scales on stems and lower surfaces of leaves with rough, spreading stellate hairs on their central bosses, these uniformly silvery or yellowish."	"Croton crispatus"