Latin name of tree belt (4)

I believe the answer is:

lash

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'tree belt' is the definition.
'lash' can be an answer for 'belt' (thesaurus). I am not sure about the 'tree' bit.

'latin name' is the wordplay.
'latin' becomes 'l'.
'name' becomes 'ash' ().
'l'+'ash'='LASH'

'of' is the link.

Can you help me to learn more?

(Other definitions for lash that I've seen before include "Flexible strip of a whip" , "Whip or scourge" , "over the eye" , "Secure with rope" , "Whip; securely fasten" .)

I've seen this clue in The Guardian.

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