Kingdom: Plantae
(Unranked): Angiosperms
(Unranked): Eudicots
(Unranked): Asterids
Order: Asterales
Family: Campanulaceae
Genus: Wahlenbergia
Species: W. matthewsii
Binomial name: Wahlenbergia matthewsii
Common names: Rock harebell, Matthew's harebell

Wahlenbergia matthewsii is a large-flowered native bluebell. It is a tap-rooted perennial having many stems arising from the one root. Its habit is limestone areas in the northern areas of the South Island. It habit ranges from coastal to montane (> 800 m a.s.l.), usually in gorges and on steep cliffs.
This erect or semi-erect plant's branches bear numerous, green, linear leaves which radiate out from the stem. Solitary, 2-3cm diameter, white to pale blue flowers appear over the summer months on stems that are >30cm high.

For more details visit: http://www.nzpcn.org.nz/flora_details.aspx?ID=703  

Photographed at Otari Wilton Bush Reserve, Wellington
Wahlenbergia matthewsii-001.JPG  

No 6.JPG  

Wahlenbergia matthewsii-004.JPG  

Wahlenbergia matthewsii 2.JPG 

Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/