Question

a shrub whose leaves are used to flavor tea

Answer 1

Camellia sinensis is a species of evergreen shrub or small tree whose leaves and leaf buds are used to produce tea. It is of the genus Camellia of flowering plants in the family Theaceae. Common names include "tea plant", "tea shrub", and "tea tree" (not to be confused with Melaleuca alternifolia, the source of tea tree oil, or Leptospermum scoparium, the New Zealand teatree).

Answer 2

Camellia Sinensis .. is an evergreen shrub tree which thrives in Forest areas. It's native to East Asia, Indian Subcontinent and Southeast Asia.
Common Names are such as : Green Tea, Tea or Black Tea.