Agnes Borinsky’s The Trees is a quirky and ambitious new play that may please some environmentalists and Thoreau-minded folk, but many theatergoers may find it hard to warm up to this work, populated with a dozen characters, many of whom flit in and out of the play in will-o’-the-wisp fashion. Directed by Tina Satter, The Trees investigates the American dream and questions whether stability is possible in a capitalistic world.