The Collaborative International Dictionary of English v.0.48:

Polyandria \Pol`y*an"dri*a\, n. pl. [NL. See Polyandry.]
   (Bot.)
   A Linn[ae]an class of monoclinous or hermaphrodite plants,
   having many stamens, or any number above twenty, inserted in
   the receptacle.
   [1913 Webster]