KEY TO THE GENERA

1	Stipules not fully amplexicaul, free; pistillate inflorescences uniflorous; receptacle of the staminate inflorescence discoid. — Widespread Antiaris
1'	Stipules fully amplexicaul, fused; pistillate inflorescences with numerous flowers; receptacle of the staminate inflorescence flabellate and bivalvate (or infundibuliform to cyathiform). — Introduced Castilla