Coastal Restoration Trust of New Zealand

Coastal Dune Ecosystem Reference Database

A brief survey of the vegetation of the proposed reserve area (Pukepuke Lagoon) Popular Article

Ogden, J.
Morphologically distinct forms of Selliera radicans Cav. growing on silty fiats in the estuary of the Rangitikei River and on sand plains in the dunes c. 1.3 km to the south are described. Small pieces of S. radicans rhizome were collected from these two areas and planted in pots containing either sand from the sand plain site, sandy-silt from the estuary site, or a standard potting mix. All were grown for 10 months under identical conditions in a glasshouse. Measurements of leaf dimensions at the beginning and end of the experiment support the view that the two forms are genetically distinct, and can be regarded as ecotypes. A clone of the sand plain form was grown tor 34 months in a garden, and the resulting changes in leaf form are illustrated. Several other species have dwarf forms on the sand plains, and it is tentatively suggested th3.t ecotypic differentiation has occurred in these species also.