Asentence with one independent clause and at least one dependent clause is called:

complex

Explanation: The word "complex" doesn't mean complicated. In a complex sentence one of the clauses depends on another clause.

covert: hidden or secret

candid: truthful and straightforward

what i get from these phrases is covert means undercover or underground and that's where the flower is in april. on the other hand, may is the month where flowers start to bloom and thats the reason why candid is being used as a word to describe the blossoming period of a flower.

hope this answer you.