It's a Titan arum (amorphophallus titanium), and its flowering is one of the rarest events in botany.
It's a South American species, Xanthosoma robustum, that's related to the dead-horse arum , philodendron, and skunk cabbage.
Green stream grass and arum tree roots covered the sides of the stream, which varied in width from 1-10m, with a soft, sandy bottom.
Though most plants are more or less at the mercy of the environment, a few such as the titan arum are able to generate heat.
The specific epithet amorphophallus refers to the central spadix of the arum , and essentially means amorphous phallus, or shapeless penis.
Among them are arrow arum , bull-tongue arrowhead, pickerelweed, water lettuce, white water lily, yellow water lily, and the invasive alligator weed.
An excellent carnivorous plant room, a rather nice pond, and the magnificent titan arum - which was still looking pretty impressive when we were there (having flowered only a day or two earlier).
Its illustrations - detailed, accurate, and delightful - portray plants ranging from Aegyptian water lily to zebra-flowered arum , commonly known as jack-in-the-pulpit.
Konnyaku is a perennial plant of the arum family, said to be indigenous to India and Ceylon.
Nonwoody plants in or near the water include arrow arum , bulltongue arrowhead, foxtail club moss, golden club, Jamaica swamp saw grass, pipewort, royal fern, tall pinebarren milkwort, and several kinds of sedges and rushes.