Contains 2 genera and 8 accepted taxa overall.
This family is completely databased for all specimens.
[Family identification key]
1. Twigs with solid and homogeneous pith; terminal leaflet largest; staminate catkins in fasciculate; stamens 3-10(-15) per flower; fruit husk dehiscent into 4 valves; nuts smooth, verrucose, or rugulose
1. Twigs with chambered pith; terminal leaflet small or absent; staminate catkins solitary; stamens 7-50 per flower; fruit husk indehiscent; nuts grooved, ridged, furrowed, or smooth