36. Madder plants, which comprise a very large family of mostly tropical trees, shrubs, and herbal, include coffee and gardenia.
i understand that "herbal/adj." is wrong and "herbal" should change into "herbs", which is parallel to "trees" and "shurbs".
what is really bothering me is how come "mostly" is not wrong !!
i checked both MW and LONGMAN, which say "mostly = mainly".
Whatever, i always believe "be mostly tropical trees" or "be mainly tropical trees" is correct. i cannot figure out how come "a family of mostly tropical trees" is not wrong!!
thanks in advance