Poisonous Evergreen Shrub: Anagram of No Dealer

Puzzle 18 of Famous Buildings Medium Pack

Question is: Poisonous Evergreen Shrub: Anagram of No Dealer

and the answer is: OLEANDER

Word Meaning:

OLEANDER — Nerium oleander, a notoriously poisonous shrub in the dogbane family, Apocynaceae, but nonetheless widely grown as an ornamental, having leathery lance-shaped leaves and deep rose-colored or white flowers.

Definitions from Wiktionary.