Embergeria or Chatham Islands sow thistle (Sonchus grandifolius) is the largest indigenous representative of the sow thistles in the New Zealand archipelago. The species is endemic to the Chatham Islands, where it is known from all of the larger vegetated islands except the Motchu Har / Forty-fours, Rakitchu / Rangitutahi […]
The Chatham Islands Sow-thistle or Embergeria grandifoliais one of two endemic plant genera known only from the Chatham Islands. For most of the last fifty years the sow-thistle has been in decline throughout the Chatham Islands such that at one time it was ranked by the International Union for the Conservation of Nature (IUCN) as “Endangered” meaning that if the decline wasn’t halted it would soon go extinct.
Since the late 1990s the Department of Conservation in cooperation with Chatham Islanders has been working to save this peculiar plant from extinction. While Chatham Island sow-thistle is probably not the most attractive looking of plants it is undoubtedly of world wide interest. Superficially resembling the introduced puwha/sow-thistles (Sonchus spp.), the Chatham Islands Sow-thistle is a much larger plant with flowering specimens sometimes reaching up to 1.8 m in height. The yellow-green leaves are very leathery and can be up to 1 m long, while the dense clusters of daisy-like flowers are produced in profusion and multi-coloured in shades of yellow, apricot and purple.