Carpophore

from WordNet (r) 3.0 (2006)

carpophore
    n 1: a slender stalk that furnishes an axis for a carpel

from The Collaborative International Dictionary of English v.0.48

Carpophore \Car"po*phore\, n. [Gr. karpo`s fruit + fe`rein to
   bear.] (Bot.)
   A slender prolongation of the receptacle as an axis between
   the carpels, as in Geranium and many umbelliferous plants.
   [1913 Webster]