1	"Inflorescence a compact, flower-like cyathium comprising an involucre of fused bracts that encloses a cluster of 1-stamened staminate flowers and 1 pistillate flower; involucre margin bearing 1--5 nectary glands, these sometimes bearing petal-like appendages"	Euphorbia
1	"Inflorescence not a cyathium, not flower-like; pistillate and staminate flowers generally +- separated, not enclosed in an involucre; stamens 2--many per staminate flower"	2
2	"Leaves opposite"	"Mercurialis {Mercurialis annua}"
2	"Leaves alternate"	3
3	"Leaf peltate, blade palmately veined and lobed, 1--5 dm; inflorescence a panicle, terminal"	"Ricinus {Ricinus communis}"
3	"Leaf not peltate, blade pinnately veined, entire or toothed, generally << 1 dm; inflorescences various"	4
4	"Petals present"	Ditaxis
4	"Petals 0"	5
5	"Stem and leaf hairs stellate"	6
5	"Stem and leaf hairs 0 or unbranched"	7
6	"Leaf margin bluntly toothed; stipules persistent; staminate inflorescence axillary"	"Bernardia {Bernardia incana}"
6	"Leaf margin entire; stipules inconspicuous; staminate inflorescence terminal or axillary"	Croton
7	"Bracts subtending pistillate flowers leaf-like, toothed, > fruit"	"Acalypha {Acalypha californica}"
7	"Bracts subtending pistillate flowers 0 or scale-like, entire, << fruit"	8
8	"Leaves with stinging, nettle-like hairs; stamens 3--6; base of pistillate bracts without glands; stem sap clear"	"Tragia {Tragia ramosa}"
8	"Leaves +- glabrous or glaucous; stamens 2--3; base of pistillate bracts with 2 large glands; stem sap milky or clear"	9
9	"Annual or perennial herb; stamens 2; seeds 2--3.5 mm"	Stillingia
9	"Tree; stamens 2--3; seeds 6--9 mm"	"Triadica {Triadica sebifera}"