Waterlily collection goes to the States (5)
I believe the answer is:
lotus
'waterlily' is the definition.
(lotus is a kind of waterlily)
'collection goes to the states' is the wordplay.
'collection' becomes 'lot' (lot is a kind of collection).
'goes to' says to put letters next to each other.
'the states' becomes 'US' (abbreviation for the United States).
'lot'+'us'='LOTUS'
(Other definitions for lotus that I've seen before include "Type of water-lily" , "Plant that mythically induces languor" , "Plant - yoga position" , "Water lily - fruit inducing forgetfulness" , "Kind of water lily" .)