Growing within swampy areas and surrounding slopes.
Scrambling over Coprosma robusta.
(I might be totally off the mark on this ID...)
Likely Lycopodium clavatum.
The Lycopodiaceae (class Lycopodiopsida, order Lycopodiales) are a family of primitive nonvascular plants, including all of the core clubmosses. These plants bear spores on specialized structures at the apex of a shoot; they resemble a tiny battle club, from which the common name derives. They are non-flowering and do not produce seeds.