The Collaborative International Dictionary of English v.0.48:

Sterculiaceous \Ster*cu`li*a"ceous\, a. [NL. Sterculia, the
   typical genus, fr. L. Sterculius the deity that presided over
   manuring, from stercus dung. So called because one of the
   original species is fetid.] (Bot.)
   Of or pertaining to a natural order (Sterculiaceae) of
   polypetalous exogenous plants, mostly tropical. The cacao
   (Theobroma Cacao) is the most useful plant of the order.
   [1913 Webster]