The spadix is over 3in.
"Hardy Perennials and Old Fashioned Flowers" by John Wood
The flowers in most of the order are small and inconspicuous, but aggregated on a spike (spadix) which may be of very large size.
"Elements of Structural and Systematic Botany" by Douglas Houghton Campbell
The four tentacles of the anti-spadix are set, three on one base and one on a separate base.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6" by Various
Flowers monoecious or dioecious, covering only the base of the spadix.
"The Manual of the Botany of the Northern United States" by Asa Gray
F, With simple spadix.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 2" by Various