Tupeia is a monotypic genus of semi-parasitic shrubs (mistletoes) which occurs in both the North and South Islands of New Zealand.

The leaves are variously shaped, fleshy, bright green and from 10 to 70 mm long.

[6] It is found in forest or scrub, on a wide range of hosts including tarata (Pittosporum eugenioides), karo (Pittosporum crassifolium), Coprosma species, putaputaweta (Carpodetus serratus), fivefinger (Pseudopanax arboreus), white maire (Nestegis lanceolata) and broom.

[6][7] The specific epithet, antarctica, derives from the Latin word, anti, meaning "against" or "opposite" and the Greek word, arktos, meaning "bear", giving an adjective, antarctica, which meant opposite the constellations of the Ursus Major and Ursus Minor, "opposing the north", or "Antarctic".

[1] A 2002 study[11] discusses the threat from possum browsing which is preventing the recruitment of new individuals.