Yes, it's an Arisaema, a Jack in the pulpit, but huh? Something's different.
The spathe, the "pulpit" is a little excessive, drooping over and curling under itself. This is not Arisaema triphyllum, the North American plant.
This is an east Asian form, which I bought several years ago at a plant show at a nature centre. I 've not identified it to species. Wikipedia lists more than 30 nominal Arisaema species, including African and Asian forms.
Since, strictly speaking, this is not a Jack in the pulpit, what to call it? I typed Jack in the pulpit into Babelfish, then translated it into Asian languages, as if the common name of this plant in those languages would be a literal translation of what it is in English. I ended up with strings of characters I'm not able to read. Not daunted, I translated those characters back into English (you can waste a lot of time at work with Babelfish).
English/Japanese/English gives: Jack of explanation/learning platform.
English/Korean/English provided: The Jack which is the unit of the box shape.
My favourite for its succinctness, English/Chinese/English gives: In rostrum Jack.