Posts tagged with Sophora

Kōwhai seeds on Kermadec and Chatham Islands’ beaches

The bight yellow seeds of kōwhai are a familiar sight on New Zealand beaches.

Plants have many ways to disperse their seeds to a suitable spot where they can germinate. Kōwhai trees have bright yellow seeds that have the amazing ability to float on water, including across oceans. Experiments have shown that kōwhai seeds can remain afloat in seawater for years and still germinate. Recent research led by scientist Lara… Read more »

The distribution of kōwhai and its close relatives throughout the Southern Hemisphere has intrigued scientists, including Charles Darwin, for over 150 years. Recent research led by Lara Shepherd has revealed more about the relationships among this iconic group of plants. Sophora sect. Edwardsia is a group of 19 species of small trees or shrubs mostly… Read more »

Coastal kōwhai in the south of its range – natural or planted?

Coastal kōwhai (Sophora chathamica). This species can be distinguished from other kōwhai species by its overlapping leaflets and lack of divaricating stage when it is young. Photo by Leon Perrie.

Science researcher Lara Shepherd explores the distribution of kōwhai in New Zealand – largely found in the north and likely introduced in the south.  Coastal kōwhai (Sophora chathamica) has a very unusual distribution. Some of its outlying populations are suggested to have been planted by Maōri. We recently published our research studying the relationships of all eight New Zealand kōwhai… Read more »

What can kōwhai tell us about the location of New Zealand’s forests during the ice ages?

  • A flower-laded large-leaved kōwhai (Sophora tetraptera) from the Wairarapa. Photo: Leon Perrie
  • A flower-laded large-leaved kōwhai (Sophora tetraptera) from the Wairarapa.
  • Collecting genetic samples from prostrate kōwhai (Sophora prostrata) on the POrt Hills. This species is restricted to the eastern South Island and has zig-zag branches with small leaves and flowers. Photo: Leon Perrie.
  • Collecting genetic samples from prostrate kōwhai (Sophora prostrata) on the POrt Hills. This species is restricted to the eastern South Island and has zig-zag branches with small leaves and flowers. Photo: Leon Perrie.

Science researcher Lara Shepherd explores kōwhai trees, one of New Zealand’s most widely recognised native plants and our unofficial national flower. Did you realise that we actually have eight species of kōwhai in New Zealand? Our DNA research investigating the relationships of these kōwhai species and where kōwhai trees were located during the ice ages has… Read more »