To what is the title of steinbeck's novel possibly a literary allusion

I believe the answer is The title of John Steinbeck’s novel The Grapes of Wrath is an allusion to a phrase in the very open stanza of “The Battle Hymn of the Republic,” which was sung by supporters of the Union during the American Civil War:

the correct answer is:

from context clues heliotrope is probably a flower.

a heliotrope are peruvian plants that have small purplish plants.

- free verse.

- " in poetry, one of the best ways to practice technique is to write in. i want all to be unstressed so that “all the clocks” and “in the night” are matching anapests. many forms that sharpen skills are useful in free verse."