What can you do if you are not familiar with an allusion referenced in a text- O Look for analogies.
O Define the allusion
o Use context clues.
O Look up the word or phrase.

Look up the word or phrase.

Explanation:

An allusion is a figure of speech used to refer to something, like a person, a place, or even an event, without naming it explicitly.

However, since allusions refer to something different from the subject at hand, the reader could not recognize the reference point.

For example, in Fahrenheit 451 there´s an allusion to the volcano Vesuvius ("Mildred ran from the parlor like a native fleeing an eruption of Vesuvius"). Those who don´t know the story about the Vesuvius´eruption should look up that word to understand the meaning of that sentence.

the correct answer is:

from context clues heliotrope is probably a flower.

a heliotrope are peruvian plants that have small purplish plants.