Amorphophallus titanum

Beccari 1834

The largest inflorescence in the world (not counting Agave which blooms only once). Comes from Sumatra.

It's rather not a houseplant (:-)). The inflorescence is more than 2 m tall and it blooms only three days.
The interior of the spadix. An insect from the Hymenoptera order can be seen among the female flowers. Maybe it's the one who pollinates the flowers?	The infructescence, more than 2 m tall, The leaves are giant, too. An adult leaf may be to 6 m tall. You can see the petioles on the right of the photo and a young leaf behind these people.

Link to The IAS page on A. titanum Link to Fairchild Tropical Garden's Amorphophallus titanum pages Link to Krzysztof Kozminski's A. titanum page Link to Bernhard Strolka's page on A. titanum.