The Collaborative International Dictionary of English v.0.48:
Stylopodium \Sty`lo*po"di*um\, n.; pl. Stylopodia. [NL. See Style, and Podium.] (Bot.) An expansion at the base of the style, as in umbelliferous plants. [1913 Webster]WordNet (r) 3.0 (2006):
stylopodium n 1: an enlargement at the base of the style in some Umbelliferae