I was looking at the "NZ species of Gingidium" by JW Dawson
To cite this article: J. W. Dawson (1967) The New Zealand species of Gingidium (Umbelliferae),
New Zealand Journal of Botany, 5:1, 84-116, DOI: 10.1080/0028825X.1967.10428736
to try and identify this plant I photographed in the Cromwell (Clutha) Basin and it most seemed like Gingidium ensyii var. spathulatum.