Doctor Cope's in Flower of New Mexico (5)

I believe the answer is:

pecos

I'm a little stuck... Click here to teach me more about this clue!

'flower of new mexico' is the definition.
'Pecos' can be an answer for 'flower' (Pecos is an example). I am not certain of the 'of new mexico' bit.

'doctor cope's' is the wordplay.
'doctor' indicates an anagram.
'copes' anagrammed gives 'PECOS'.

'in' is the link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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