This should be Chascolytrum rufum J.Presl (see http://www.nzpcn.org.nz/flora_details.aspx?ID=3530 and http://nzflora.landcareresearch.co.nz/default.aspx?selected=NameDetails&TabNum=0&NameId=0C82A0D9-1C78-4218-8C84-B805AC223F9F)
This is an uncommon naturalised grass of inner Auckland (mostly found along Symond Street, within the University of Auckland campus grounds), Grafton Cemetery, and on the western side of Grafton Gully, Auckland Domain. Images show a plant admixed with an iridaceous plant growing in a street planting of Phormium cookianum subsp. hookeri (see http://naturewatch.org.nz/observations/2398982).
Voucher collected and will be lodged in the Auckland Museum Herbarium (AK)
Briza is a genus of annual and perennial grasses in the family Poaceae, native to northern temperate regions. The group is generally referred to as the quaking grasses because the flowers and seedheads shake on their stalks in the slightest breeze. Some of its members are grown as ornamental plants.