Read the text and determine if the sentence is true:

Ageratum ( ), (whiteweed in the USA), is a genus of 40 to 60 tropical and warm temperate flowering annuals and perennials from the family Asteraceae, tribe Eupatorieae. Most species are native to Central America and Mexico but four are native to the United States.

Sentence: More than 6 species are native to Central America and Mexico.
It's impossible to say