Need help with a quiz the answers are all names of trees?

Question

sounds like a divided island 7 letters

a tall slim london borough 6 letters

a tusky smile 4 and 4 letters

this mp looks bleary has she over slept 5 letters

Answer 1

London borough could be Poplar

MP is probably Hazel

Cypress could be Island

The other one could be Horn beam

Answer 2

First one is Cypress

Answer 3

They can't be british trees as I have just looked in the collins complete guide to british wildlife and none of the clues fit