Read the sentences.
the arctic region, where winters are long and cold, is home to more than 400 species of flowering plants.
which group of words is an adjective clause in the sentence?

of flowering plants

is home to more than 400 species of flowering plants

the arctic region, where winters are long and cold

where winters are long and cold

The answer to your question would be that the group of words that is an adjective clause in the sentence is the following one: Where winters are long and cold.

Explanation:

It is a nonessential adjective clause, which is also called relative clause.  This means that the information it provides is not relevant to identify the noun it modifies or to complete the meaning of the sentence. Consequently, it could be dropped without altering the meaning of the sentence (see 1). That is why it is offset with commas from the main sentence.

1) The Arctic region is home to more than 400 species of flowering plants

imparadis't in one anothers arms  

the happier eden, shall enjoy their fill  

of bliss on bliss, while i to hell am thrust,  

where neither joy nor love, but fierce desire,  

among our other torments not the least,  

still unfulfill'd with pain of longing pines;  

yet let me not forget what i have gain'd  

from their own mouths; all is not theirs it seems:  

one fatal tree there stands of knowledge call'd,  

forbidden them to taste: knowledge forbidd'n?  

suspicious, reasonless. why should their lord  

envie them that? can it be sin to know,

from the count of monte cristo there are two synonyms of the word “grotto”. these words are chamber and cavern.