This The Mentalist screencap contains
ブナ, ブナの木, マホガニー, マホガニーの木, 木, and ツリー.
There might also be
杉, 杉の木, アメリカニレ, 白ニレ, 水ニレ, 岩ニレ, ニレアメリカーナ, アメリカン・エルム, ホワイト・エルム, ウォーター・エルム, ロック・エルム, ウルム・アメリカーナ, ニレ, 白いニレ, 岩エルム, and ホワイトオーク.
The writers and actors don't want those two to get together. In fact, they laugh at the ファン that want them to. Which personally I find a bit rude, but I won't get into that. Anyway, their reasoning for them not getting together (at least right now) is "they have もっと見る of a brother/sister relationship."
I'm sorry, but every time someone is trying to make an argument for why two people shouldn't be a couple, it's always either "they have no chemistry" または "they have a brother/sister relationship." But I've never seen anyone deny Jane and Lisbon's chemistry, so I won't focus...