Subjects of the 2019 Pulitzer-winning novel "The Overstory" (5)

I believe the answer is:

trees

(Other definitions for trees that I've seen before include "Tall, perennial, woody plants" , "Tall, perennial, woody plant" , "Elders perhaps" , "Woods" , "''I see ... of green / Red roses too'' (What a Wonderful World)" .)

I've seen this clue in The New York Times.

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