Spiky Tree With White Flowers and Reddish Berries
Puzzle 1 of City Nicknames Hard Pack
Question is: Spiky Tree With White Flowers and Reddish Berries
and the answer is: HAWTHORN
Word Meaning:
HAWTHORN — Any of various shrubs and small trees of the genus Crataegus having small, apple-like fruits and thorny branches
Definitions from Wiktionary.