Don't think it is Poa annua as in standing water with duckweed.
Trackside on the Circular Walk at Pelorus Bridge. Abundant at some sites in the wider locality.
This tree I will be monitoring daily as part of the Myrtle Rust monitoring project.
open Kanuka woodland along fenceline; in general 50% of Kanuka in area are light to heavily flowering. note the square stems!