sentences:  According to Clarkson & Clarkson (1994) ecological investigations in North Island's six locations, "Pittosporum obcordatum" prefers habitat is river flats, usually "near backswamps and margins of oxbow lakes and cut-off meanders", with <200 meters altitude, 9~15 degree Celsius mean annual temperatures, 1000 mm~1500 mm mean annual rainfall and frequent raining in winter and drought summer.