Abstract
Lepidium peregrinum (Brassicaceae) is recorded for the first time in New Zealand, where it was collected from O Wiwi Ku, an island in Kawhia Harbour, western North Island. Although native to eastern Australia, L. peregrinum was initially described from plants collected wild in the United Kingdom. This and other European occurrences are believed to have arisen from seed trapped within sheep fleeces imported from Australia. It is suggested that the sole New Zealand occurrence also results from the importing of goods directly from Sydney, New South Wales, to Kawhia by Maori during the 1830s to 1860s. A description of L. peregrinum based on New Zealand specimens is provided. The biostatus of L. peregrinum is reviewed and, despite being treated as naturalized, it is concluded that the species poses no threat to the indigenous New Zealand flora. As a threatened Australian plant, recommendations are made about the conservation management of the species in New Zealand.
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