Monkey Monkey Puzzle Puzzle

The text gives several clues about objects, places, etc that are reduplicated words. The answers in order are as follows.

1. Jelly-like substance made from algae— AGAR-AGAR
2. Spa town in Germany— BADEN-BADEN
3. Hotpot— SHABU-SHABU
4. Poofy dog— CHOW-CHOW
5. Bloodsucking fly— TSE-TSE
6. Crater in Tanzania— NGORONGORO
7. Hawaiian fish— MAHI-MAHI
8. Imogen Heap band— FROU FROU
9. Town on Campbell Island in British Columbia— BELLA BELLA
10. Coffee ordered the Canadian way at Tim Horton's— DOUBLE-DOUBLE
11. Middle Eastern cereal dish— COUSCOUS
12. Fast Latin dance— CHA CHA
13. Character in Catch-22— MAJOR MAJOR
14. Prison north of New York City— SING-SING
15. Large green fruit with a creamy inside, sort of like a custard apple or soursop— PAWPAW

The numbers below are indices into the answers, and spell out ANSWER ARAUCARIA. Araucaria is the genus of the monkey-puzzle tree which is referenced in the title, and so that is the answer.