Hamlin Hannibal Garland wrote the line "O to dream of the plain" in a poem 
Hamlin Hannibal Garland wrote the line "O to dream of the plain" in a poem titled "In" this entity." Another poem titled after this substance urges the reader to "shovel them under" and ponders whether in two or ten years, passengers will ask the conductor "What place is this? / Where are we now?," unaware that they are at Gettysburg, Ypres, Verdun, Austerlitz, or Waterloo. For 10 points, name this plant that "covers all" in a work by Carl Sandburg, and which "is singing" in a novel by Doris Lessing.
Hamlin Hannibal Garland wrote the line "O to dream of the plain" in a poem titled "In" this entity."
grass