Stinging nettles (Urtica dioica) don't always have the best reputation among gardeners, but they are a crucial part of the ecosystem for many British butterfly caterpillars. Luke says, 'Host plants ...

The worst blow yet to the butterfly — and its rare host plant, the Tecate cypress — came in 2003 ... the San Diego Biodiversity Project petitioned the U.S. Fish and Wildlife Service to list the Thorne ...