Kingdom: Plantae
(Unranked): Angiosperms
(Unranked): Monocots
(Unranked): Commelinids
Order: Poales
Family: Poaceae
Genus: Rytidosperma
Species: R. petrosum
Binomial name: Rytidosperma petrosum
Common name: Cook Strait bristle grass

Rytidosperma petrosum is predominantly a coastal species of stiff, wiry and rather densely tufted grass. It is endemic to the Cook Strait Region, Kapiti, Stephens and D’Urville Islands, South Wellington and Wairarapa Coast to Cape Palliser. It inhabits very exposed, dry, sunny, lichen-encrusted cliff faces. It is threatened at some sites on the South Wellington coastline by weeds and quarrying.

For more details visit http://nzpcn.org.nz/flora_details.asp? ID=673

Photographed at Otari Native Botanic Garden and Wilton's Bush Reserve. Wellington.
Rytidosperma petrosum-002.JPG 
Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0