Author and orchid expert Mike Waller said: 'To find Britain's second colony of small-flowered tongue-orchids is exciting in itself but to find them on a green roof in the City of London is extraordinary. 'This is clear evidence that with patience and dedication, even the most unlikely places can become havens for some of our rarest wildlife.' Rare orchids thought to have been extinct in the UK since 2009 are found on a London office ROOFTOP | Daily Mail Online
This idea of (re-)establishment from nearish populations is somewhat akin to the governmental rationalization as to why Marah oregana (with circa 100 plants in BC), is not considered an endangered species -- because it seems like the origins of these BC plants is from occasional northward migration of Washington state-origin seed.
